I got this error message recently on a project that worked fine when I tried last (WordPress for iOS). The error didn’t make any sense, and no matter what I tried the app wouldn’t compile anymore, always stopping with the following error message:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/ibtool failed with exit code 255
I can imagine Xcode gets confused at times, as I currently have Xcode 4.6.3 and Xcode 5.0 installed, and I use them both (though not at the same time).
A quick Google search reveals a few possibilities to clear this up:
- clean the app (Product – Clean)
- restart Xcode
- reboot your system
The latter point worked for me. Threads dealing with the same problem: