I am learning reactjs through a tutorial and ran into this error. That says "Cannot read property 'keys' of undefined" My code is very minimal so I assume that it has to do with the structure of the language. Does anyone know the problem and a possible solution?
<!DOCTYPE html>
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.0.1/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.0.1/react-dom.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/6.1.19/browser.min.js"></script>
<title>ReactJs</title>
</head>
<body>
<div id="app"></div>
<script type="text/babel">
var HelloWorld = ReactDOM.createClass({
render: function() {
return
<div>
<h1>Hello World</h1>
<p>This is some text></p>
</div>
}
});
ReactDOM.render(
<HelloWorld />, document.getElementById('app'));
</script>
</body>
</html>
