Quote Originally Posted by knuckle-101
Im sorry , forgot to repost the fix, the error was caused from a image that did not have an extension jpg, gif so on.

Anyone who uses this mod, make sure you have extensions at the end of the image you upload for the product.

Rob
As that code is just a copy of the zen-cart core code, I'd say you might have the same problem even without this contrib for the additional images section.. but im not sure.