错误：元素类型无效：应为字符串（对于内置组件）或类/函数（对于复合组件），但得到：您可能忘记了从定义组件的文件中导出组件，或者您可能混淆了默认导入和命名导入。
检查Details的渲染方法。
下面我附上的代码。我已经仔细检查了一切仍然是给错误。我不知道是什么问题在渲染Details.js
这是App.js代码。

import * as React from 'react';
import { NavigationContainer } from '@react-navigation/native';
import { createNativeStackNavigator } from '@react-navigation/native-stack';

import HomeScreen from './Home';
import DashboardScreen from './Dashboard'
import DetailsScreen from './Details';

const Stack = createNativeStackNavigator();

const MyStack = () => {
  return (
    <NavigationContainer>
      <Stack.Navigator>
        <Stack.Screen name="Details" component={DetailsScreen}/>
        <Stack.Screen
          name="Home"
          component={HomeScreen}
          options={{ title: 'Welcome' }}
        />
        <Stack.Screen name="Dashboard" component={DashboardScreen} />
        
      </Stack.Navigator>
    </NavigationContainer>
  );
}; 

export default MyStack

下面是Details.js代码。

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

const Details = () => {
    return(
        <View style = {{flex: 1,justifyContent:'center',alignItems:'center'}}>
            <Text>
                Enter Details Here
            </Text>
        </View>
    )
}
export default Details;