While reading pngcrush caught libpng error: Read Error

Here is how to fix the Xcode build warning: While reading [X] pngcrush caught libpng error: Read Error

1. Select the project navigator (default view in left-most pane of Xcode, the one with the folder icon)
2. At the bottom, there is a search filter for these files. Type the name of the offending file here
3. You should see more than one copy of the offending file, perhaps in different directories
4. Slow select the file twice (to enable rename mode) and rename each copy of the file a different name
5. Build and clean!

Hope it helps!