未定义不是对象（评估的.NativeModules.ExponentNotifications.getExponentPushTokenAsync'）

Question

我使用的是来自react-native的应用程序。但是在设备上运行应用程序时，会出现以下错误：

App.js ：

import React, {Component} from 'react';
import {Platform, StyleSheet, Text, View, TouchableOpacity} from 'react-native'; 
import Exponent, {Font, Components} from 'exponent';

import {
  NavigationProvider,
  StackNavigation,
  SharedElementOverlay
} from '@exponent/ex-navigation'; 
import stl from './components/theme';

const instructions = Platform.select({
  ios: 'Press Cmd+R',
  android: 
    'Shake or press',
});
type Props = {};
export default class App extends Component<Props> {
  render() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>Welcome to React Native!</Text>
      </View>
    );
  }
}
const styles = StyleSheet.create({
  container: {
    flex: 1
  },
  welcome: {
    fontSize: 20
  },
  instructions: {
    textAlign: 'center'
  },
});

package.json：

{
  "name": "mobileshopping",
  "version": "0.0.0",
  "description": "Hello Exponent!",
  "author": "mironcatalin@gmail.com",
  "private": true,
  "dependencies": {
    "@exponent/ex-navigation": "^2.0.0",
    "@exponent/vector-icons": "~2.0.3",
    "expo": "^33.0.6",
    "exponent": "~11.0.2",
    "react": "~15.3.2",
    "react-native": "0.39.0",
    "react-native-animate-number": "^0.1.2"
  },
  "devDependencies": {
    "@exponent/vector-icons": "^2.0.3"
  }
}

当我删除App.js文件的第三行时，它工作正常。谁能说为什么出现此错误？

新手：（

感谢分享。

Answer 1

“ Exponent”项目已更名为“ Expo”。该软件包现在称为“ expo”。

https://www.npmjs.com/package/exponent

检查链接。