The problem might be because your project > target > Build Phases > Compile Sources is trying to compile a file that doesn’t exist. It might be in there twice, like the below screen shot. My project contains UIImage+FFXtras, I can even remove it and re-add it and this won’t resolve the problem!
I’m not sure how the project gets into this state – but I know it’s not obvious what is going wrong. Highlight the red problem one and remove it.
So have a look in compile sources phase for the file clang is complaining about.