可能未处理的承诺拒绝反应原生

如何解决可能未处理的承诺拒绝反应原生

我收到以下错误：可能未处理的承诺拒绝 (id:0): TypeError: null is not an object (evaluating 'Voice.destroySpeech')'

我正在尝试将语音转换为文本，我使用了不同的库（react-native-voice / react-native-google-cloud-speech-to-text )，我也遇到了同样的错误。 希望有人能帮我解决这个问题

    import React from 'react';
import {
  StyleSheet,Text,View,Button,AppRegistry,} from 'react-native';
import Voice from 'react-native-voice';
export default class VoiceNative extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      recognized: '',started: '',results: [],};
Voice.onSpeechStart = this.onSpeechStart.bind(this);
    Voice.onSpeechRecognized = this.onSpeechRecognized.bind(this);
    Voice.onSpeechResults = this.onSpeechResults.bind(this);
  }
componentwillUnmount() {
    Voice.destroy().then(Voice.removeAllListeners);
  }
onSpeechStart(e) {
    this.setState({
      started: '√',});
  };
onSpeechRecognized(e) {
    this.setState({
      recognized: '√',});
  };
onSpeechResults(e) {
    this.setState({
      results: e.value,});
  }
async _startRecognition(e) {
    this.setState({
      recognized: '',});
    try {
      await Voice.start('en-US');
    } catch (e) {
      console.error(e);
    }
  }
render () {
    return (
      <View>
        <Text style={styles.transcript}>
            Transcript
        </Text>
        {this.state.results.map((result,index) => <Text style={styles.transcript}> {result}</Text>
        )}
        <Button style={styles.transcript}
        onPress={this._startRecognition.bind(this)}
        title="Start"></Button>
      </View>
    );
  }
}
const styles = StyleSheet.create({
  transcript: {
    textAlign: 'center',color: '#B0171F',marginBottom: 1,top: '400%',},});
AppRegistry.registerComponent('VoiceNative',() => VoiceNative);