Xcode error : Distill failed for unknown reasons

Does anybody know why this error happens on Xcode 5?

Answer

I had this problem when I accidentally renamed a .psd as a .png. Converting the image to an actual png instead of a Photoshop file fixed it for me.

You might have migrated from a normal project to use an image.catalog. So you can definitely try to copy the bundle resource like launch images. It is so because migrating to an asset catalog for icons and launch images apparently doesn't always add itself to the target automatically.

You can find more on this here & here.

I hope that helps.