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

One more for the fun of it :) In my case I extracted regularly used models into separate files and imported them. So the proptype definition looked something like this:

 static propTypes = {
        ...
        selectedAction: shape(ACTION),
        ...
};

My error was that I wrote an additional curly in the shape:

static propTypes = {
        ...
        selectedAction: shape({ACTION}),
        ...
};