Too much code, too much data, far too much cruft. Thin the problem down to about 10-20 lines of code that can be run without depending on anything except the image manipulation modules (GD::*).

My guess is that you are missing a GIF plugin of some sort, but there is no way I'm going to bother setting up an entire system just to find that out for you and given the paucity of replies so far, I doubt many others are driven to reply until the wood has been thined a little so the trees can be seen.