如果在之外使用会导致错误，解决方法是将所有的组件嵌套在组件中。

下面是一个示例代码：

import React from 'react';
import { BrowserRouter as Router, Route } from 'react-router-dom';

const App = () => {
  return (
    
      

        
My App
        
        
        
      
    
  );
};

const Home = () => {
  return (
    

      
Home Page
      
Welcome to my home page!
    
  );
};

const About = () => {
  return (
    

      
About Page
      
This is the about page.
    
  );
};

const Contact = () => {
  return (
    

      
Contact Page
      
You can contact us here.
    
  );
};

export default App;

在上面的代码中，组件被嵌套在组件内，确保了组件只在之内使用。