Error: system file has been modified since precompiled header was built

Question

I just downloaded the final version of xcode 6 and to compile a project that I was working with the beta, now generates the following error simulator apparently, someone can hel

Answer 1

Quit Xcode and remove everything in the module cache located here:

~/Library/Developer/Xcode/DerivedData/ModuleCache

The cache that was built with a previous version of Xcode is invalid for this version of Xcode and SDK, and that is causing your error.