Element type is invalid

[perfecten]

您好，代码clone下来后，npm i之后，app启动出错。信息如下

---

Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in.

Check the render method of contentComponent.

把app.js中的以下代码注释掉，就能运行了

contentComponent: props => (

<Image
source={require('./images/run.png')}
style={[styles.icon]}
/>
<DrawerView.Items {...props}/>

)

[perfecten]

另外 在地图上面感觉覆盖了一层东西，看不到地图。如果把下面的center={state.center}删除后就看到地图了。

    <BaiduMap style={{flex: 1}}
      mode={1}
      center={state.center}

[Waullen]

你第一个问题中，组件DrawerView.Items改成DrawerItems，并导入import {DrawerNavigator,DrawerItems} from 'react-navigation';这个问题就解决了