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vivo ran into the same problem
[Try this method](https://github.com/florent37/Flutter-AssetsAudioPlayer/issues/846#issuecomment-2447809339)
This method helped me. Add the following content to the assets_audio_player_web library ` compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } kotlinOptions { jvmTarget = '1.8' } ` 
I had the same problem, ``` e: file:///C:/Users/Admin/AppData/Local/Pub/Cache/hosted/pub.dev/assets_audio_player-3.1.1/android/src/main/kotlin/com/github/florent37/assets_audio_player/notification/NotificationService.kt:168:70 Unresolved reference: drawable e: file:///C:/Users/Admin/AppData/Local/Pub/Cache/hosted/pub.dev/assets_audio_player-3.1.1/android/src/main/kotlin/com/github/florent37/assets_audio_player/notification/NotificationService.kt:172:82 Unresolved reference: drawable e: file:///C:/Users/Admin/AppData/Local/Pub/Cache/hosted/pub.dev/assets_audio_player-3.1.1/android/src/main/kotlin/com/github/florent37/assets_audio_player/notification/NotificationService.kt:176:83 Unresolved reference: drawable e: file:///C:/Users/Admin/AppData/Local/Pub/Cache/hosted/pub.dev/assets_audio_player-3.1.1/android/src/main/kotlin/com/github/florent37/assets_audio_player/notification/NotificationService.kt:180:82 Unresolved reference: drawable e: file:///C:/Users/Admin/AppData/Local/Pub/Cache/hosted/pub.dev/assets_audio_player-3.1.1/android/src/main/kotlin/com/github/florent37/assets_audio_player/notification/NotificationService.kt:184:82 Unresolved reference:...
I encountered the same problem. My app used PDF in two places. The first place had no problem, but the second place kept encountering this problem.