react-native：我得到错误无法找到变量：＆＃39; title

Question

当我学习反应原生时，我得到错误

  

＆＃39;标题＆＃39;找不到

但我定义了标题。

import React,{Component} from 'react';
import {View,Text,StyleSheet,TextInput} from 'react-native';
import SubmitButton from './SubmitButton';
import {white,black,gray} from '../utils/colors';
import {saveDeckTitle} from '../utils/api';
import {addDeck} from '../Actions';
import {connect} from 'react-redux';
 class NewDeck extends Component{
 state={
    title:''
  };
 submit=()=>{
   const {title}=this.state;
   saveDeckTitle(title);
   this.props.dispatch(addDeck(title));
 };

render(){
    return (
        <View style={styles.container}>
            <Text style={styles.question}>What is the title of your new 
deck?</Text>
            <Text style={{marginTop:50,alignSelf:'flex- 
start',fontSize:20}}>Deck Title</Text>
            <TextInput
                style={styles.textInput}
                onChangeText={(title) => {this.setState({title})}}
                value={this.state.title}
                placeholder='Deck Title'
                placeholderTextColor={gray}
                underlineColorAndroid={gray}
                keyboardType="default"
            />
            <Text style={{height:200}}/>
            <SubmitButton style={styles.submitBtn}  onPress= 
{this.submit}>Submit</SubmitButton>
            <Text>{this.state.title}</Text>
        </View>
    )
}
}  

行动中：

export const ADD_DECK='ADD_DECK';

export function addDeck(title) {
  return {
    type:ADD_DECK,
    title
}

这样的错误：

  

无法找到变量：＆＃39; title＆＃39;

enter image description here

当我没有添加'this.props.dispatch(addDeck(title));'时效果很好，我想知道为什么我得到此错误