Can't add integration (Config flow could not be loaded: {"message":"Invalid handler specified"})

[nilsburg]

When trying to add the integration a popup shows with the following message:

Config flow could not be loaded: {"message":"Invalid handler specified"}

It was working but it stopped working since upgrading HA to 2024.6.3 (I think because of #2288) and wasn't able to reload (there was no reload option). I decided to remove the integration, remove the component from HACS and start fresh, but after adding the component with HACS and trying to add the integration I get the error.

1. Go to 'Settings > Devices & services'
2. Click on 'Add integration > Alexa Media Player'
3. See error

System details

• Home-assistant (version): Core 2024.6.5, OS 12.4
• alexa_media (version from const.py or HA startup): 4.10.2
• alexapy (version from pip show alexapy or HA startup): for some reason can't figure out, pip show alexapy returns Package(s) not found: alexapy
• Amazon 2FA is enabled (y/n). : yes

Logs

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/loader.py", line 1249, in _load_platform
    cache[full_name] = self._import_platform(platform_name)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/loader.py", line 1281, in _import_platform
    return importlib.import_module(f"{self.pkg_path}.{platform_name}")
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/util/loop.py", line 131, in protected_loop_func
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/importlib/__init__.py", line 90, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1310, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 995, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/config/custom_components/alexa_media/__init__.py", line 16, in <module>
    from alexapy import (
  File "/usr/local/lib/python3.12/site-packages/alexapy/__init__.py", line 41, in <module>
    __maintainer__ = metadata["maintainer"]
                     ~~~~~~~~^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/importlib_metadata/_adapters.py", line 54, in __getitem__
    raise KeyError(item)
KeyError: 'maintainer'
2024-06-29 08:33:26.214 WARNING (MainThread) [homeassistant.util.loop] Detected blocking call to import_module inside the event loop by integration 'config' at homeassistant/components/config/config_entries.py, line 179: return await super()._post_impl(request, data) (offender: /usr/src/homeassistant/homeassistant/loader.py, line 1281: return importlib.import_module(f"{self.pkg_path}.{platform_name}")), please create a bug report at https://github.com/home-assistant/core/issues?q=is%3Aopen+is%3Aissue+label%3A%22integration%3A+config%22
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/usr/src/homeassistant/homeassistant/__main__.py", line 223, in <module>
    sys.exit(main())
  File "/usr/src/homeassistant/homeassistant/__main__.py", line 209, in main
    exit_code = runner.run(runtime_conf)
  File "/usr/src/homeassistant/homeassistant/runner.py", line 190, in run
    return loop.run_until_complete(setup_and_run_hass(runtime_config))
  File "/usr/local/lib/python3.12/asyncio/base_events.py", line 672, in run_until_complete
    self.run_forever()
  File "/usr/local/lib/python3.12/asyncio/base_events.py", line 639, in run_forever
    self._run_once()
  File "/usr/local/lib/python3.12/asyncio/base_events.py", line 1988, in _run_once
    handle._run()
  File "/usr/local/lib/python3.12/asyncio/events.py", line 88, in _run
    self._context.run(self._callback, *self._args)
  File "/usr/local/lib/python3.12/site-packages/aiohttp/web_protocol.py", line 452, in _handle_request
    resp = await request_handler(request)
  File "/usr/local/lib/python3.12/site-packages/aiohttp/web_app.py", line 543, in _handle
    resp = await handler(request)
  File "/usr/local/lib/python3.12/site-packages/aiohttp/web_middlewares.py", line 114, in impl
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/security_filter.py", line 92, in security_filter_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/forwarded.py", line 83, in forwarded_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/request_context.py", line 26, in request_context_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/ban.py", line 85, in ban_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/auth.py", line 242, in auth_middleware
    return await handler(request)
  File "/usr/src/homeassistant/homeassistant/components/http/headers.py", line 32, in headers_middleware
    response = await handler(request)
  File "/usr/src/homeassistant/homeassistant/helpers/http.py", line 73, in handle
    result = await handler(request, **request.match_info)
  File "/usr/src/homeassistant/homeassistant/components/http/decorators.py", line 81, in with_admin
    return await func(self, request, *args, **kwargs)
  File "/usr/src/homeassistant/homeassistant/components/http/data_validator.py", line 70, in wrapper
    return await method(view, request, data, *args, **kwargs)
  File "/usr/src/homeassistant/homeassistant/components/config/config_entries.py", line 172, in post
    return await self._post_impl(request, data)
  File "/usr/src/homeassistant/homeassistant/components/config/config_entries.py", line 179, in _post_impl
    return await super()._post_impl(request, data)

2024-06-29 08:33:26.216 ERROR (MainThread) [homeassistant.loader] Unexpected exception importing platform custom_components.alexa_media.config_flow
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/loader.py", line 1249, in _load_platform
    cache[full_name] = self._import_platform(platform_name)
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/loader.py", line 1281, in _import_platform
    return importlib.import_module(f"{self.pkg_path}.{platform_name}")
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/util/loop.py", line 131, in protected_loop_func
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/importlib/__init__.py", line 90, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1310, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 935, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 995, in exec_module
  File "<frozen importlib._bootstrap>", line 488, in _call_with_frames_removed
  File "/config/custom_components/alexa_media/__init__.py", line 16, in <module>
    from alexapy import (
  File "/usr/local/lib/python3.12/site-packages/alexapy/__init__.py", line 41, in <module>
    __maintainer__ = metadata["maintainer"]
                     ~~~~~~~~^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/importlib_metadata/_adapters.py", line 54, in __getitem__
    raise KeyError(item)
KeyError: 'maintainer'
2024-06-29 08:33:26.217 ERROR (MainThread) [homeassistant.config_entries] Error occurred loading flow for integration alexa_media: Exception importing custom_components.alexa_media.config_flow