TypeError: instance.render在使用react-router-dom时不是函数

import MyComponent from './MyComponent';

const WrappedComponent = withSomeHOC(MyComponent);

npm list react-router-dom

npm install react-router-dom@latest

import React from 'react';

class MyComponent extends React.Component {
  render() {
    return <div>Hello World</div>;
  }
}

export default MyComponent;

import React from 'react';
import { BrowserRouter as Router, Route, Switch } from 'react-router-dom';
import Home from './Home';
import About from './About';

function App() {
  return (
    <Router>
      <Switch>
        <Route exact path="/" component={Home} />
        <Route path="/about" component={About} />
      </Switch>
    </Router>
  );
}

export default App;