Actually, I have no idea why I have this error.
Follows the code hoping that there is everything useful for a diagnosis.
The structure of the app is a standa
Your problem is the wrong placement of resources(images). You use (API 23) but resources for API 23 is null, because they only API 24 and up.
Now all images marked (v24) this means that they are in drawables-v24 just move in drawable
that'll solve your problem.