title: Attempted import error: 'App' is not exported from './App'
body: <p>I'm working on a currency converter app, I got the code from code pen (<a href="https://codepen.io/jmean/pen/Oxmgxp" rel="noreferrer">https://codepen.io/jmean/pen/Oxmgxp</a>). I'm trying to run this code and I get this error: ./src/index.js
  Attempted import error: 'App' is not exported from './App'.</p>
  
  <p>I've tried adding export default App(); on index.js and also on App.js file but its not working.</p>
  
  <pre><code>import React from 'react';
  import ReactDOM from 'react-dom';
  import './index.css';
  import {App} from './App';
  import * as serviceWorker from './serviceWorker';
  
  ReactDOM.render(&lt;App /&gt;, document.getElementById('root'));
  </code></pre>
  
  <p>I expected the code to compile and display on the browser like it does on code pen.</p>