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"