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

On XCODE 9 one cause of this is a bug in XCODE 9.1 with old .XIB files.

Fix:

1. Upgrade to XCODE 9.2

2. All your .XIB files should be set to iOS 8.1 version or higher.