Keep generating checksum of 0 for images

[me-silly]

Hello, this is my first time delving into making a plugin and while I'm getting the hang of it, I am having some weird issues with getting both the cardback.jpg and the cardspawn.jpg to work. When I use the command /mkupdate plugins/zombie/updatelist.txt to generate the checksums it always comesback 0. I am assuming this is why they aren't showing up. I have attached both the update list I created and the one after running the checksum command.

A bonus issue is that the cards are now appearing too wide, as if they're almost square. I find this odd since I am mostly updating an older plugin my group uses so that we can add new cards ourselves. Any help would be appreciated and if I need to be clearer in my explanations please let me know. Thanks!

EDIT: here's how the cards look whereas before they had normal dimensions: http://i.imgur.com/lqKdsWI.png

figured it out