Javascript 无法读取属性'；routeName'；未定义-反应导航抽屉的

每次将值传递给drawer config时，我都会遇到这个错误，但是当我使用它而不传递任何配置时，它工作正常

我使用以下命令时出错：

const Drawer = DrawerNavigator({
 AboutUs: { screen: AboutUsScreen },
 Options: { screen: OptionsScreen },
  Home: { screen: HomeScreen }
  }, {
  initialRouteName: 'Home',
   drawerPosition: 'right',
  });

   const Drawer = DrawerNavigator({
   AboutUs: { screen: AboutUsScreen },
   Options: { screen: OptionsScreen },
   Home: { screen: HomeScreen }
   });

使用此选项时没有错误：

const Drawer = DrawerNavigator({
 AboutUs: { screen: AboutUsScreen },
 Options: { screen: OptionsScreen },
  Home: { screen: HomeScreen }
  }, {
  initialRouteName: 'Home',
   drawerPosition: 'right',
  });

   const Drawer = DrawerNavigator({
   AboutUs: { screen: AboutUsScreen },
   Options: { screen: OptionsScreen },
   Home: { screen: HomeScreen }
   });

我花了好几个小时想弄明白，但运气不好

完整代码：

import React, { Component } from 'react';
 import {
Platform,
StyleSheet,
Text,
View
} from 'react-native';

import { Card, ListItem, Button, Icon } from 'react-native-elements'
import { DrawerNavigator } from 'react-navigation'
import HomeScreen from './Home'
import OptionsScreen from './Options'
import AboutUsScreen from './AboutUs'


const Drawer = DrawerNavigator({
AboutUs: { screen: AboutUsScreen },
Options: { screen: OptionsScreen },
Home: { screen: HomeScreen }
}, {
initialRouteName: 'Home',
drawerPosition: 'right',
});


export default Drawer ;

我补充说：

 drawerOpenRoute: 'DrawerOpen',
 drawerCloseRoute: 'DrawerClose',
 drawerToggleRoute: 'DrawerToggle'

到抽屉配置，它现在正在工作：）