Package seems to be broken. I believe the flutter package was split into modules
pikaur -S spotube
Reading repository package databases...
Reading local package database...
Resolving AUR dependencies...
:: error: Can't resolve dependencies for AUR package 'flutter-target-linux':
:: error: Dependencies missing for flutter-target-linux
:: warning: Following package cannot be found in AUR:
flutter-engine-linux
Build 3.7.0 was successful, but the new version Can't be launched normally as older before.
Here is the error info on when to start it in consoles
(process:4599): GLib-GObject-CRITICAL **: 09:56:14.777: g_object_new_is_valid_property: object class 'MyApplication' has no property named 'com.github.KRTirtho.Spotube'
** (spotube:4599): CRITICAL : 09:56:14.886: FlBinaryMessenger fl_engine_get_binary_messenger(FlEngine ): assertion 'FL_IS_ENGINE(self)' failed
** (spotube:4599): CRITICAL : 09:56:14.886: FlTextureRegistrar fl_engine_get_texture_registrar(FlEngine ): assertion 'FL_IS_ENGINE(self)' failed
** (spotube:4599): CRITICAL : 09:56:14.886: FlPluginRegistrar fl_plugin_registrar_new(FlView , FlBinaryMessenger , FlTextureRegistrar ): assertion 'FL_IS_BINARY_MESSENGER(messenger)' failed
Use MAKEPKG_SPOTUBE_LASTFM_API_KEY and MAKEPKG_SPOTUBE_LASTFM_API_SECRET to provide required infomation. See https://github.com/KRTirtho/spotube/blob/master/.env.example for more info.
Get Last.fm API key and secret at https://www.last.fm/api/account/create