reactjs Cannot read property ‘keys’ of undefined

Edit: oddly, after our comments above, I checked to see if it was indeed the babel core version, I am using this one in my fiddle:

https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.24/browser.js

The second I switch to your version above I get this:

Uncaught TypeError: Cannot read property 'keys' of undefined

Use React.createClass not ReactDOM.createClass and wrap multiple lines of html in parenthesis like so:

Working Example: https://jsfiddle.net/69z2wepo/38998/

var Hello = React.createClass({
  render: function() {
    return (     
       <div>
        <h1>Hello World</h1>
        <p>This is some text</p>
       </div>
    )
  }
});

ReactDOM.render(
  <Hello name="World" />,
  document.getElementById('container')
);