The file *.storyboardc was not found

Question

I am trying to submit iOS app with extension, but get a weird error on validation:

Answer 1

I guess it's a bug. I solved this problem when I moved Main.storyboard (NSExtensionMainStoryboard defined in info.plist) to the subdirectory of extension target. It means that you can't localize main.storyboard, because it will be moved to base directory or specific language directory.