react-nativeiteratortypeof符号错误

这是App呈现的第一个页面;

import React, { Component } from 'react';
import { Provider } from 'react-redux';
import { createStore, applyMiddleware } from 'redux';
import ReduxThunk from 'redux-thunk';
import reducers from './reducers';
import Router from './Router';

class Main extends Component {
  componentWillMount() {
      const firebase = require('firebase');
    firebase.initializeApp({
        apiKey: "AIzaSyDFO_Rfas36L8R8p6qxTvCr843ajeamoMs",
        authDomain: "helloworld-e510b.firebaseapp.com",
        databaseURL: "https://helloworld-e510b.firebaseio.com",
        projectId: "helloworld-e510b",
        storageBucket: "helloworld-e510b.appspot.com",
        messagingSenderId: "316625723749"
  });
  }
  render() {
    const store = createStore(reducers, {}, applyMiddleware(ReduxThunk));
    return (
      
        
      
    );
  }
}

export default Main;

import React from 'react';
import { Scene, Router, Actions } from 'react-native-router-flux';
import MainPage from './components/MainPage';

const RouterCompOnent= () => {
    return (
      
      
        
      
      
    );
};

export default RouterComponent;

// symbol polyfills
global.Symbol = require('core-js/es6/symbol');
require('core-js/fn/symbol/iterator');

// collection fn polyfills
require('core-js/fn/map');
require('core-js/fn/set');
require('core-js/fn/array/find');