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

If you change your deployment target to 8.0, you can get it to run on iPhone 6 simulator.

Mine wasn't working either, I updated deployment target to 8.0, cleaned project, ran on simulator and the build worked fine.

Then I downgraded the deployment target to 7.1, picked 5S 7.1 simulator and it also correctly built and ran.

Answer 2

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.