React: checker is not a function

Question

I\'m getting this weird warning message in the console for my React app.

Warning: Failed propType: checker is not a function Check the render method of <

Answer 1

A pull request has been merged to the React repo that provides a better feedback for the developer whenever a mistake like this happens again.

Now, the validation message will look like the following:

Invalid argument supplied to oneOf, expected an instance of array.

https://github.com/facebook/react/pull/3963

This should be part of React 0.14.