After deleting/adding some png files to project, i have got messages when building project.
\"file ProjectPath\\aaa\\xxx.png is missing from working copy.\"
In my case I drag & dropped a number of files on my Xcode project window to add them. It made copies into my source directory but didn't put them where I wanted them to go (it put them at the root of my directory, I wanted them in a sub-directory). Without thinking I just grabbed them in the Finder and moved them to the directory I wanted them in. After going back into the project window it of course could not find them so I deleted them in the window and re added them. After compiling I started getting these errors.
I thought, as some mention above that it was a git issue but when I ran "git ls-tree --full-tree -r HEAD" I didn't see the files at all??
Anyway to fix it all I did was use the "Add File..." menu command to add each of the files to the default location, do a clean build, and then delete them from the project window (using move to trash) and it got rid of all the errors.