Xcode Crashes with Assertion Failure in SourceCache

Question

I am getting following error when I try to edit any file in my project.

ASSERTION FAILURE in /SourceCache/IDEFoundation/IDEFoundation-943/Framework/Classes/         


        

Answer 1

This is solved now. This was due to missing repository in XCode. I had to go to Organizer -> Repositories and press + button in bottom left corner to add repository. After which my project is compiling very well. Thanks Horst for your effort though.

Answer 2

Read-only source/plist/project files had been the root cause for the same problem with my Xcode. You may just verify that all files in your project folder are writable.