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

Try to find and resave this *.PNG files using "Preview", to be exact: File - Export... - "save as PNG". It seems to me, that it happens when you saving image in Photoshop with mode "Save for Web" and after this image will be saved with special compressing (LZW). That's all, good luck!