whenever i transcribe audio to text by using this package its giving me a empty json , how to solve this

`import 'dart:developer';
import 'dart:io';
import 'dart:typed_data';
import 'package:flutter/services.dart';
import 'package:vosk_flutter/vosk_flutter.dart';

class VoskTranscriber {
late VoskFlutterPlugin _vosk;
Recognizer? _recognizer;

VoskTranscriber() {
initializeVosk();
}

Future initializeVosk() async {
Model? _model;
const _sampleRate = 16000;
String? _error;
SpeechService? _speechService;
print("_initializeVosk called");
_vosk = VoskFlutterPlugin.instance();
final modelPath = await ModelLoader()
.loadFromAssets('assets/models/vosk-model-small-en-us-0.15.zip')
.then(
(modelPath) => _vosk.createModel(modelPath)) // create model object
.then((model) => _model = model)
.then((_) => _vosk.createRecognizer(
model: _model!, sampleRate: _sampleRate)) // create recognizer
.then((value) => _recognizer = value)
.then((recognizer) {
if (Platform.isAndroid) {
_vosk
.initSpeechService(_recognizer!) // init speech service
.then((speechService) => _speechService = speechService)
.catchError((e) => _error = e.toString());
print("sampleRate : ${_sampleRate}");
}
}).catchError((e) {
_error = e.toString();
return null;
});

// print("modelPath :$modelPath");
// _recognizer = await _vosk.createRecognizer(
// model: Model(modelPath, const MethodChannel("")), sampleRate: 16000);
}

Future transcribeAudio(Uint8List audioBytes) async {
print("transcribeAudio function called");
List results = [];
int chunkSize = 8192;
int pos = 0;

while (pos + chunkSize < audioBytes.length) {
final resultReady = await _recognizer!.acceptWaveformBytes(
Uint8List.fromList(audioBytes.sublist(pos, pos + chunkSize)),
);
pos += chunkSize;

if (resultReady) {
String result = await _recognizer!.getResult();
log("complete result in vosk : ${result}");
results.add(result);
} else {
String result = await _recognizer!.getPartialResult();

log("partial result in vosk : ${result}");
results.add(result);
}
}

await _recognizer!
.acceptWaveformBytes(Uint8List.fromList(audioBytes.sublist(pos)));
results.add(await _recognizer!.getFinalResult());

return results.join(' ');
}
}
`

log

`og] partial result in vosk : {
"partial" : ""
}
[log] complete result in vosk : {
"text" : ""
}
15
[log] partial result in vosk : {
"partial" : ""
}
I/flutter (10378): transcribedText : {
I/flutter (10378): "partial" : ""
I/flutter (10378): } {
I/flutter (10378): "partial" : ""
I/flutter (10378): } {`