【flutter】audioplayerでPlatformExceptionが出る

udioplayers: 4.1.0

エラーはこちら。

Unhandled Exception: PlatformException(AndroidAudioError, assets/audio/whistle.wav: open failed:

E/flutter (12458): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(AndroidAudioError, assets/audio/whistle.wav: open failed: ENOENT (No such file or directory), java.io.FileNotFoundException: assets/audio/whistle.wav: open failed: ENOENT (No such file or directory)
E/flutter (12458):      at libcore.io.IoBridge.open(IoBridge.java:574)
E/flutter (12458):      at java.io.FileInputStream.<init>(FileInputStream.java:160)
E/flutter (12458):      at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1209)
E/flutter (12458):      at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1187)
E/flutter (12458):      at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1152)
E/flutter (12458):      at xyz.luan.audioplayers.source.UrlSource.setForMediaPlayer(UrlSource.kt:16)
E/flutter (12458):      at xyz.luan.audioplayers.player.MediaPlayerPlayer.setSource(MediaPlayerPlayer.kt:53)
E/flutter (12458):      at xyz.luan.audioplayers.player.WrappedPlayer.setSource(WrappedPlayer.kt:29)
E/flutter (12458):      at xyz.luan.audioplayers.AudioplayersPlugin.methodHandler(AudioplayersPlugin.kt:126)
E/flutter (12458):      at xyz.luan.audioplayers.AudioplayersPlugin.access$methodHandler(AudioplayersPlugin.kt:29)
E/flutter (12458):      at xyz.luan.audioplayers.AudioplayersPlugin$onAttachedToEngine$1$1.invoke(AudioplayersPlugin.kt:50)
E/flutter (12458):      at xyz.luan.audioplayers.AudioplayersPlugin$onAttachedToEngine$1$1.invoke(AudioplayersPlugin.kt:50)
E/flutter (12458):      at xyz.luan.audioplayers.AudioplayersPlugin$safeCall$1.invokeSuspend(AudioplayersPlugin.kt:75)
E/flutter (12458):      at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
E/flutter (12458):      at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
E/flutter (12458):      at kotlinx.coroutines.internal.LimitedDispatcher.run(LimitedDispatcher.kt:42)
E/flutter (12458):      at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:95)
E/flutter (12458):      at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:570)
E/flutter (12458):      at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
E/flutter (12458):      at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:677)
E/flutter (12458):      at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:664)
E/flutter (12458): Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
E/flutter (12458):      at libcore.io.Linux.open(Native Method)
E/flutter (12458):      at libcore.io.ForwardingOs.open(ForwardingOs.java:563)
E/flutter (12458):      at libcore.io.BlockGuardOs.open(BlockGuardOs.java:274)
E/flutter (12458):      at libcore.io.ForwardingOs.open(ForwardingOs.java:563)
E/flutter (12458):      at android.app.ActivityThread$AndroidOs.open(ActivityThread.java:7758)
E/flutter (12458):      at libcore.io.IoBridge.open(IoBridge.java:560)
E/flutter (12458):      ... 20 more

assetsに配置しているローカルファイルを指定する場合は、AssetSourceを使うと治ると思います。

  void _playAlarm() async {
    const localFile = "audio/s.mp3";
    await player.play(AssetSource(localFile));
  }

https://stackoverflow.com/questions/76405192/unhandled-exception-platformexceptionandroidaudioerror-setdatasource-failed