This is the error Message in Xcode:
While checking alphas in /Path/[email protected]
pngcrush
caught libpng error: Not enough image dCommand /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/copypng emitted errors but did not return a nonzero exit code to indicate failure
But the Application is running fine even with this error. Even the image is loading on the iPhone 4 running iOS 6.0
I tried removing the image and adding it again. Also tried saving it into png from Preview.
Im my case because of redundancy of images it was happening so I deleted all those images which ever was causing error.And Error was gone...!