Missing file warnings showing up after upgrade to Xcode 4

Question

I recently upgraded to Xcode 4 (which is a great upgrade) but now I\'m getting some warnings that I did not get before. I have looked through forums and other SO posts but

Answer 1

I had that bug and found no way to solve it other than creating an empty file on that position and then deleting it. It happened with files I had deleted from the project, and cleaning, building, deleting manually the Derived Data directory didn't work either. I believe it is a bug, and that it can be quite painful if it happens with more than a few files.