[BUG] Project fails to build

[dmcspadden]

Describe the bug After adding the source project to my solution and clicking build 130 errors are indicated. They all appear to be android .png files? Trying to build the source project on its own, using VS 2019 and VS 2019 Preview yields the same issue.

Exception or Stack Trace 1>Microsoft.Azure.NotificationHubs.Client -> C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\bin\Debug\netstandard2.1\Microsoft.Azure.NotificationHubs.Client.dll 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-mdpi-v4_abc_ic_commit_search_api_mtrl_alpha.png.flat: error: failed to open file. "drawable-mdpi-v4_abc_ic_commit_search_api_mtrl_alpha.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-mdpi-v4\abc_ic_commit_search_api_mtrl_alpha.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-ldrtl-xxxhdpi-v17_abc_spinner_mtrl_am_alpha.9.png.flat: error: failed to open file. "drawable-ldrtl-xxxhdpi-v17_abc_spinner_mtrl_am_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-ldrtl-xxxhdpi-v17\abc_spinner_mtrl_am_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-ldrtl-xhdpi-v17_abc_ic_menu_copy_mtrl_am_alpha.png.flat: error: failed to open file. "drawable-ldrtl-xhdpi-v17_abc_ic_menu_copy_mtrl_am_alpha.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-ldrtl-xhdpi-v17\abc_ic_menu_copy_mtrl_am_alpha.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_text_select_handle_middle_mtrl_light.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_text_select_handle_middle_mtrl_light.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_text_select_handle_middle_mtrl_light.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_textfield_search_default_mtrl_alpha.9.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_textfield_search_default_mtrl_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_textfield_search_default_mtrl_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_scrubber_control_to_pressed_mtrl_005.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_scrubber_control_to_pressed_mtrl_005.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_scrubber_control_to_pressed_mtrl_005.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_list_selector_disabled_holo_light.9.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_list_selector_disabled_holo_light.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_list_selector_disabled_holo_light.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_ic_commit_search_api_mtrl_alpha.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_ic_commit_search_api_mtrl_alpha.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_ic_commit_search_api_mtrl_alpha.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-mdpi-v4_abc_text_select_handle_middle_mtrl_dark.png.flat: error: failed to open file. "drawable-mdpi-v4_abc_text_select_handle_middle_mtrl_dark.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-mdpi-v4\abc_text_select_handle_middle_mtrl_dark.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable_abc_list_selector_background_transition_holo_dark.xml.flat: error: failed to open file. "drawable_abc_list_selector_background_transition_holo_dark.xml.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable\abc_list_selector_background_transition_holo_dark.xml : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xxxhdpi-v4_abc_scrubber_control_to_pressed_mtrl_005.png.flat: error: failed to open file. "drawable-xxxhdpi-v4_abc_scrubber_control_to_pressed_mtrl_005.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xxxhdpi-v4\abc_scrubber_control_to_pressed_mtrl_005.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xxhdpi-v4_abc_btn_switch_to_on_mtrl_00001.9.png.flat: error: failed to open file. "drawable-xxhdpi-v4_abc_btn_switch_to_on_mtrl_00001.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xxhdpi-v4\abc_btn_switch_to_on_mtrl_00001.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-mdpi-v4_abc_list_selector_disabled_holo_dark.9.png.flat: error: failed to open file. "drawable-mdpi-v4_abc_list_selector_disabled_holo_dark.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-mdpi-v4\abc_list_selector_disabled_holo_dark.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-ldrtl-mdpi-v17_abc_ic_menu_copy_mtrl_am_alpha.png.flat: error: failed to open file. "drawable-ldrtl-mdpi-v17_abc_ic_menu_copy_mtrl_am_alpha.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-ldrtl-mdpi-v17\abc_ic_menu_copy_mtrl_am_alpha.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: color_abc_background_cache_hint_selector_material_light.xml.flat: error: failed to open file. "color_abc_background_cache_hint_selector_material_light.xml.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\color\abc_background_cache_hint_selector_material_light.xml : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: layout_notification_template_big_media_narrow_custom.xml.flat: error: failed to open file. "layout_notification_template_big_media_narrow_custom.xml.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\23\jl\res\layout\notification_template_big_media_narrow_custom.xml : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-v21_abc_action_bar_item_background_material.xml.flat: error: failed to open file. "drawable-v21_abc_action_bar_item_background_material.xml.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-v21\abc_action_bar_item_background_material.xml : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-mdpi-v4_abc_text_select_handle_left_mtrl_light.png.flat: error: failed to open file. "drawable-mdpi-v4_abc_text_select_handle_left_mtrl_light.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-mdpi-v4\abc_text_select_handle_left_mtrl_light.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-mdpi-v4_abc_textfield_search_default_mtrl_alpha.9.png.flat: error: failed to open file. "drawable-mdpi-v4_abc_textfield_search_default_mtrl_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-mdpi-v4\abc_textfield_search_default_mtrl_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-mdpi-v4_abc_textfield_search_activated_mtrl_alpha.9.png.flat: error: failed to open file. "drawable-mdpi-v4_abc_textfield_search_activated_mtrl_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-mdpi-v4\abc_textfield_search_activated_mtrl_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-ldrtl-xxhdpi-v17_abc_ic_menu_copy_mtrl_am_alpha.png.flat: error: failed to open file. "drawable-ldrtl-xxhdpi-v17_abc_ic_menu_copy_mtrl_am_alpha.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-ldrtl-xxhdpi-v17\abc_ic_menu_copy_mtrl_am_alpha.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_text_select_handle_middle_mtrl_dark.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_text_select_handle_middle_mtrl_dark.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_text_select_handle_middle_mtrl_dark.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_cab_background_top_mtrl_alpha.9.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_cab_background_top_mtrl_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_cab_background_top_mtrl_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_ic_commit_search_api_mtrl_alpha.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_ic_commit_search_api_mtrl_alpha.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_ic_commit_search_api_mtrl_alpha.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-mdpi-v4_abc_text_select_handle_right_mtrl_light.png.flat: error: failed to open file. "drawable-mdpi-v4_abc_text_select_handle_right_mtrl_light.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-mdpi-v4\abc_text_select_handle_right_mtrl_light.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-mdpi-v4_abc_list_selector_disabled_holo_light.9.png.flat: error: failed to open file. "drawable-mdpi-v4_abc_list_selector_disabled_holo_light.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-mdpi-v4\abc_list_selector_disabled_holo_light.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-ldrtl-xhdpi-v17_abc_spinner_mtrl_am_alpha.9.png.flat: error: failed to open file. "drawable-ldrtl-xhdpi-v17_abc_spinner_mtrl_am_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-ldrtl-xhdpi-v17\abc_spinner_mtrl_am_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-ldrtl-hdpi-v17_abc_ic_menu_copy_mtrl_am_alpha.png.flat: error: failed to open file. "drawable-ldrtl-hdpi-v17_abc_ic_menu_copy_mtrl_am_alpha.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-ldrtl-hdpi-v17\abc_ic_menu_copy_mtrl_am_alpha.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_text_select_handle_left_mtrl_light.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_text_select_handle_left_mtrl_light.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_text_select_handle_left_mtrl_light.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_textfield_activated_mtrl_alpha.9.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_textfield_activated_mtrl_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_textfield_activated_mtrl_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_text_select_handle_right_mtrl_light.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_text_select_handle_right_mtrl_light.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_text_select_handle_right_mtrl_light.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_text_select_handle_left_mtrl_dark.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_text_select_handle_left_mtrl_dark.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_text_select_handle_left_mtrl_dark.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_scrubber_control_off_mtrl_alpha.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_scrubber_control_off_mtrl_alpha.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_scrubber_control_off_mtrl_alpha.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_text_select_handle_middle_mtrl_light.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_text_select_handle_middle_mtrl_light.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_text_select_handle_middle_mtrl_light.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_textfield_search_default_mtrl_alpha.9.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_textfield_search_default_mtrl_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_textfield_search_default_mtrl_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-ldrtl-xxhdpi-v17_abc_ic_menu_cut_mtrl_alpha.png.flat: error: failed to open file. "drawable-ldrtl-xxhdpi-v17_abc_ic_menu_cut_mtrl_alpha.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-ldrtl-xxhdpi-v17\abc_ic_menu_cut_mtrl_alpha.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-mdpi-v4_abc_cab_background_top_mtrl_alpha.9.png.flat: error: failed to open file. "drawable-mdpi-v4_abc_cab_background_top_mtrl_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-mdpi-v4\abc_cab_background_top_mtrl_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: color_abc_background_cache_hint_selector_material_dark.xml.flat: error: failed to open file. "color_abc_background_cache_hint_selector_material_dark.xml.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\color\abc_background_cache_hint_selector_material_dark.xml : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-ldrtl-xxxhdpi-v17_abc_ic_menu_copy_mtrl_am_alpha.png.flat: error: failed to open file. "drawable-ldrtl-xxxhdpi-v17_abc_ic_menu_copy_mtrl_am_alpha.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-ldrtl-xxxhdpi-v17\abc_ic_menu_copy_mtrl_am_alpha.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_text_select_handle_right_mtrl_dark.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_text_select_handle_right_mtrl_dark.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_text_select_handle_right_mtrl_dark.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_textfield_search_activated_mtrl_alpha.9.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_textfield_search_activated_mtrl_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_textfield_search_activated_mtrl_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_scrubber_control_to_pressed_mtrl_000.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_scrubber_control_to_pressed_mtrl_000.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_scrubber_control_to_pressed_mtrl_000.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-hdpi-v4_abc_list_selector_disabled_holo_dark.9.png.flat: error: failed to open file. "drawable-hdpi-v4_abc_list_selector_disabled_holo_dark.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-hdpi-v4\abc_list_selector_disabled_holo_dark.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-mdpi-v4_abc_scrubber_control_to_pressed_mtrl_005.png.flat: error: failed to open file. "drawable-mdpi-v4_abc_scrubber_control_to_pressed_mtrl_005.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-mdpi-v4\abc_scrubber_control_to_pressed_mtrl_005.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xxhdpi-v4_abc_menu_hardkey_panel_mtrl_mult.9.png.flat: error: failed to open file. "drawable-xxhdpi-v4_abc_menu_hardkey_panel_mtrl_mult.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xxhdpi-v4\abc_menu_hardkey_panel_mtrl_mult.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_text_select_handle_left_mtrl_light.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_text_select_handle_left_mtrl_light.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_text_select_handle_left_mtrl_light.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_textfield_default_mtrl_alpha.9.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_textfield_default_mtrl_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_textfield_default_mtrl_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_scrubber_control_to_pressed_mtrl_000.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_scrubber_control_to_pressed_mtrl_000.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_scrubber_control_to_pressed_mtrl_000.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_scrubber_control_off_mtrl_alpha.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_scrubber_control_off_mtrl_alpha.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_scrubber_control_off_mtrl_alpha.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_list_selector_disabled_holo_light.9.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_list_selector_disabled_holo_light.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_list_selector_disabled_holo_light.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-mdpi-v4_abc_text_select_handle_right_mtrl_dark.png.flat: error: failed to open file. "drawable-mdpi-v4_abc_text_select_handle_right_mtrl_dark.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-mdpi-v4\abc_text_select_handle_right_mtrl_dark.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-ldrtl-xxhdpi-v17_abc_spinner_mtrl_am_alpha.9.png.flat: error: failed to open file. "drawable-ldrtl-xxhdpi-v17_abc_spinner_mtrl_am_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-ldrtl-xxhdpi-v17\abc_spinner_mtrl_am_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable_abc_list_selector_background_transition_holo_light.xml.flat: error: failed to open file. "drawable_abc_list_selector_background_transition_holo_light.xml.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable\abc_list_selector_background_transition_holo_light.xml : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_menu_hardkey_panel_mtrl_mult.9.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_menu_hardkey_panel_mtrl_mult.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_menu_hardkey_panel_mtrl_mult.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xxhdpi-v4_abc_cab_background_top_mtrl_alpha.9.png.flat: error: failed to open file. "drawable-xxhdpi-v4_abc_cab_background_top_mtrl_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xxhdpi-v4\abc_cab_background_top_mtrl_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_text_select_handle_middle_mtrl_dark.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_text_select_handle_middle_mtrl_dark.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_text_select_handle_middle_mtrl_dark.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_textfield_search_activated_mtrl_alpha.9.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_textfield_search_activated_mtrl_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_textfield_search_activated_mtrl_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_textfield_activated_mtrl_alpha.9.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_textfield_activated_mtrl_alpha.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_textfield_activated_mtrl_alpha.9.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_scrubber_control_to_pressed_mtrl_005.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_scrubber_control_to_pressed_mtrl_005.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_scrubber_control_to_pressed_mtrl_005.png : error APT2261: file failed to compile. 1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Preview\MSBuild\Xamarin\Android\Xamarin.Android.Aapt2.targets(127,3): error APT2098: drawable-xhdpi-v4_abc_list_selector_disabled_holo_dark.9.png.flat: error: failed to open file. "drawable-xhdpi-v4_abc_list_selector_disabled_holo_dark.9.png.flat: error: failed to open file.". 1>C:\Users\davidm\Downloads\azure-notificationhubs-xamarin-main\azure-notificationhubs-xamarin-main\src\Microsoft.Azure.NotificationHubs.Client\obj\Debug\monoandroid90\lp\28\jl\res\drawable-xhdpi-v4\abc_list_selector_disabled_holo_dark.9.png : error APT2261: file failed to compile. 1>Done building project "Microsoft.Azure.NotificationHubs.Client.csproj" -- FAILED.

To Reproduce Steps to reproduce the behavior: Add source project to existing Xamarin Forms solution. Click build.

Code Snippet Add the code snippet that causes the issue.

Expected behavior A clear and concise description of what you expected to happen.

Screenshots If applicable, add screenshots to help explain your problem.

Setup (please complete the following information):

• OS: [e.g. iOS 13.x]
• IDE : [e.g. Visual Studio 2019]
• Version of the Library used

Additional context Add any other context about the problem here.

Information Checklist Kindly make sure that you have added all the following information above and checkoff the required fields otherwise we will treat the issuer as an incomplete report

• [x] Bug Description Added
• [x] Repro Steps Added
• [x] Setup information Added

[dmcspadden]

Commenting out the following in Xamarin.Android.Aapt2.targets allows the project to build, but that's probably not an ideal solution given the warning message at the top of that file....

<Target Name="_CompileResources"
    Condition=" '$(_AndroidUseAapt2)' == 'True' "
    Inputs="$(MSBuildAllProjects);$(_AndroidBuildPropertiesCache);@(_CompileResourcesInputs)"
    Outputs="@(_CompileResourcesInputs->'%(_ArchiveDirectory)%(_FlatFile)')"
    DependsOnTargets="$(_BeforeCompileResources);_ConvertResourcesCases;_CalculateResourceFileName"
  >
  <!--<Aapt2Compile
      ContinueOnError="$(DesignTimeBuild)"
      DaemonMaxInstanceCount="$(Aapt2DaemonMaxInstanceCount)"
      DaemonKeepInDomain="$(_Aapt2DaemonKeepInDomain)"
      ExtraArgs="$(AndroidAapt2CompileExtraArgs)"
      FlatFilesDirectory="$(_AndroidLibraryFlatFilesDirectory)"
      FlatArchivesDirectory="$(_AndroidLibraryFlatArchivesDirectory)"
      ResourcesToCompile="@(_CompileResourcesInputs)"
      ResourceDirectories="$(MonoAndroidResDirIntermediate)"
      ResourceNameCaseMap="$(_AndroidResourceNameCaseMap)"
      ToolPath="$(Aapt2ToolPath)"
      ToolExe="$(Aapt2ToolExe)"
  />-->
</Target>

[juanevp]

For future reference, this also happened to me in Windows. In my case the problem turned out to be that the length of those paths exceeded the max path length allowed by Windows. I fixed it by moving the repository to a directory closer to the root.