当我尝试在Expo中启动我的应用程序时，我得到了这个错误。我的代码似乎根本没有被命中。

ERROR  Warning: React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: object. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

Check the render method of `withDevTools(Anonymous)`.
    in withDevTools(Anonymous)
    in RCTView (created by View)
    in View (created by AppContainer)
    in RCTView (created by View)
    in View (created by AppContainer)
    in AppContainer
    in main(RootComponent)

下面是我的App.tsx文件，它是最小的：

import { registerRootComponent } from "expo";
import React from "react";
import { Text, View } from "react-native";

function App() {
  return (
    <View>
      <Text>Hello world</Text>
    </View>
  );
}

registerRootComponent(App);