Yesterday I installed the official Xcode 7 and when I tried to open one of my Swift projects, appeared an alert saying that the new Xcode version wants to update my swift co
unfortunately, I always has the same error as you are. I suggest the best way for you is recreating an new project by new Xcode and the transplant all the code to this new project, the problem will solve. By the way, after updating any place like framework or xcode, this error may be occur, the apple is stupid.