app/main.js line 8: React.render(new ReactApp({}), mountNode)

[idamag]

In [email protected], it will cause error: Uncaught Error: Invariant Violation: React.render(): Invalid component element. This may be caused by unintentionally loading two independent copies of React.

But change the code to React.render(<ReactApp />,mountNode)，it will be correct.

[zonakusu]

This fixed my problem, thanks a lot!