My Apps,js File (React) is unfortunately not displayed in the Localhost 3000. i get somehow no further i have already tried everything

Question

My Apps.js File (React) is unfortunately not displayed in the Localhost 3000. I get somehow no further I have already tried everything

    import React from 'react';
    
    import { About, Footer, Header, Skills, Testimonial, Work } from './container';
    import { Navbar } from './components';
    import './App.scss';
    
    const App = () => (
      <div className="app">
        <Navbar />
        <Header />
        <About />
        <Work />
        <Skills />
        <Testimonial />
        <Footer />
      </div>
    );
    
    export default App;