Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class

Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.

This error is located at:

    in RCTView (at View.js:60)

    in View (at AppContainer.js:102)

    in RCTView (at View.js:60)

    in View (at AppContainer.js:122)

    in AppContainer (at renderApplication.js:32)

throwOnInvalidElementType

D:\Test\sa\node_modules\react-native\Libraries\Renderer\ReactNativeRenderer-dev.js:4706:4

createFiberFromElement ....

错误描述：

有一个元素是无效的，一个字符串或者一个类或函数命名出错；

错误原因：

解决方案：

详细查找你导入的js文件，定义的字符串或函数名称引用错误；

把 ：

import App from './app';

替换成：

import App from './App';