Tutorial 3 - Runtime Errors

[Wobling]

When trying to use the CommentList and CommentForm I receive these errors.

Warning: React.createElement: type should not be null, undefined, boolean, or number. It should be a string (for DOM elements) or a ReactClass (for composite components). Check the render method of CommentBox.

Uncaught Error: Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: undefined. Check the render method of CommentBox.

  var CommentBox = React.createClass({
    render: function() {
      return (
        <div className="commentBox">
          <h1>Comments</h1>
          <CommentList />
          <CommentForm />
        </div>
      );
    }
  });
  ReactDOM.render(
    <CommentBox />,
    document.getElementById('content')
  );

Any help is greatly appreciated.

[Wobling]

My Mistake, ReactDom needed to be at the end of the file.
ReactDOM.render(
,
document.getElementById('content')
);

[flacoman91]

thanks for this. I was getting stuck too!

[carlpoole]

I just became a victim of this too. Thanks for helping me fix it.

[githubuser441]

Thanks I read over it so I got also stuck on it