[HELP]: Why is `event.decibels` not providing a value?

[LdzLq]

I need Help for :

• Using the API:

1. FlutterSoundRecorder().startRecorder()
2. FlutterSoundRecorder().onProgress!.listen((e){})

• Generate an Android App
• not work code:

 _recorder.onProgress!.listen((e) {
        print('Current dB: ${e.decibels}');
        print('onProgress called'); 
        if (e.decibels != null) {
          _currentDb.value = e.decibels!;
          print('Current dB: ${e.decibels}');
        }

-additions I am certain that the recording permissions are not an issue, and when I save the audio recorded by startRecorder() to the local storage, it plays with sound using a media player.