Uncaught ReferenceError: mountNode is not defined

Question

forgive me i\'ve searched everywhere and I\'m new in reactjs and trying out examples. I have an error

Uncaught ReferenceError: mountNode is not defined 
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Answer 1

Being the accepted answer done, I'd like to add one thing: Don't forget to include references to all necessaries js's libs in your html head section if you are testing this out of "kit examples folder"

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://npmcdn.com/react@15.3.1/dist/react.js"></script>
<script src="https://npmcdn.com/react-dom@15.3.1/dist/react-dom.js"></script>
<script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>

Answer 2

You need to tell React where to mount the <UserGist /> component. You probably want to replace mountNode with document.getElementById('example') to refer to your <div id="example"></div> element:

React.render(
  <UserGist source="https://api.github.com/users/octocat/gists" />,
  document.getElementById('example')
);