Why am I getting ibtool failed with exit code 255?

Question

All of a sudden I can\'t build my project. I get the following compiler error:

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.pl

Answer 1

Got this just now with XCode 8.3.

For me, I just quit XCode, then cleaned the app and rebuilt. It was fine after that.

The cause for me was adding new string files for a localized storyboard.