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

Follow the steps:

 1. Take an image. 

 2. Rename it to the showing error png's name. 

 3. Drag it back to the Xcode.