Clicking Run just makes the icon spin forever


I am currently on on step 12 of the ReactJS Part I tutorial. When I click the Run button, the icon just spins forever on the Run button.


Here's my code:


var React = require('react');
var ReactDOM = require('react-dom');

// Write code here:
ReactDOM.render(<h1>Render me!</h1>, document.getElementById('container'));


<!DOCTYPE html>
<html lang="en">
	<meta charset="utf-8">
	<link rel="stylesheet" href="/styles.css">
	<title>Learn ReactJS</title>

  <span id="container"></span>
  <script src="/app.compiled.js"></script>


How do I progress?


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