Hi guys, to everyone is having this problem I just have the solution for the moment, we are waiting the new release of calabash/Xcode with the issues fixed.
Error when update the Xcode to 6 and maintain calabash 0.9.169:
Gem needs a manual update for Xcode 6.0!
Download Xcode 5 and reinstall: https://developer.apple.com/downloads/index.action
If you still having problems, download the project and run both scripts install.sh as sudo: https://github.com/kstenerud/iOS-Universal-Framework
So, we are tracking this bug and I hope the solution come fast 🙂