Speech to Text not listening in Flutter

Question

I googled for a long time to figure out why my app is not listening to my void. It just ends by itself as soon as I click the button. Here is my code:

import 'package:flutter/material.dart';
import 'package:avatar_glow/avatar_glow.dart';
import 'package:speech_to_text/speech_to_text.dart' as stt;

class SpeechScreen extends StatefulWidget {
  @override
  _SpeechScreenState createState() => _SpeechScreenState();
}

class _SpeechScreenState extends State<SpeechScreen> {

  late stt.SpeechToText _speech;
  bool _isListening = false;
  String _text = 'Press the button and start speaking';
  double _confidence = 1.0;

  void _listen() async {
    if (!_isListening) {
      bool available = await _speech.initialize(
        onStatus: (status) => print('onStatus: $status'),
        onError: (errorNotification) => print('onError: $errorNotification'),
      );
      if (available) {
        setState(() => _isListening = true);
        _speech.listen(
          onResult: (val) => setState(() {
            _text = val.recognizedWords;
            if (val.hasConfidenceRating && val.confidence > 0) {
              _confidence = val.confidence;
            }
          }),
        );
      }
    } else {
      setState(() => _isListening = false);
      _speech.stop();
    }
  }

  @override
  void initState() {
    super.initState();
    _speech = stt.SpeechToText();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Confidence: ${(_confidence * 100.0).toStringAsFixed(1)}%'),
      ),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
      floatingActionButton: AvatarGlow(
        animate: _isListening,
        glowColor: Theme.of(context).primaryColor,
        endRadius: 75.0,
        duration: const Duration(milliseconds: 2000),
        repeatPauseDuration: const Duration(milliseconds: 100),
        repeat: true,
        child: FloatingActionButton(
          onPressed: _listen,
          child: Icon(_isListening ? Icons.mic : Icons.mic_none),
        ),
      ),
      body: SingleChildScrollView(
        reverse: true,
        child: Container(
          padding: const EdgeInsets.fromLTRB(30.0, 30.0, 30.0, 150.0),
          child: Text(
            _text,
            style: const TextStyle(
              fontSize: 32.0,
              color: Colors.black,
              fontWeight: FontWeight.w400,
            ),
          ),
        ),
      ),
    );
  }
}

I added this in the main manifest:

<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.INTERNET"/>

and changed to minSdkVersion 21

But when I click the button, it throws me this message: When I click the button, it throws me this at once:

E/BluetoothAdapter(16910): Bluetooth binder is null
I/flutter (16910): onStatus: listening
I/flutter (16910): onStatus: notListening
I/flutter (16910): onStatus: done
I/flutter (16910): onError: SpeechRecognitionError msg: error_permission, permanent: true

Thank you very much for your help in advance