Uncaught Invariant Violation: addComponentAsRefTo(...):
After installation, I got this following error:

> Uncaught Invariant Violation: addComponentAsRefTo(...): Only a ReactOwner can have refs. You might be adding a ref to a component that was not created inside a component's `render` method, or you have multiple copies of React loaded (details: https://fb.me/react-refs-must-have-owner).

What's that mean? What's wrong with my installed package before?
