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

Change

React.PropTypes.oneOfType(React.PropTypes.number, React.PropTypes.object)

to

React.PropTypes.oneOfType([React.PropTypes.number, React.PropTypes.object])

(the argument should be an array)