Build app with Xcode 4 - it always show some error about PNG image

Question

When I build my app with Xcode 4 it always show this error message:

CopyPNGFile /Users/michaelchen/Library/Developer/Xcode/DerivedData/iMusicBox-boeawugacmha         


        

Answer 1

That happens when you have multiple entries for the image file in your project file. I have no idea why but I just removed all entries, reloaded the project and added the file again.