Cocoapods: Not enough arguments provided; where is the input document to operate on?

Question

My simple cocoapod project has only 4 files (3 classes and 1 storyboard):

But I permanently have an issue like on the image below:

Not enough arguments provided; where is the inout document to operate on?

What to do to eliminate it?

Answer 1

Remove PhotoGallery.storyboard file from the Compile Sources build phase and add to Copy Bundle Resources phase.

Answer 2

Remove PhotoGallery.storyboard file from Classes folder and move it to Assets folder. This solved my problem.