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

In my case I got this when I used the shape function with a complex object. The solution was to go from:

outerObject: shape({
  firstInnerObject: {
    a: string,
    b: string,
  },
  secondInnerObject: {
    a: string,
    b: number,
  },
}),

To:

outerObject: shape({
  firstInnerObejct: shape({
    a: string,
    b: string,
  }),
  secondInnerObject: shape({
    a: string,
    b: number,
  }),
}),

Very trivial, I know, yet this might be the solution for someone equally inexperienced as I am. ;)