its not the pack that was the problem its a minecraft bug I attached the pack, if i have violated a rule tell me and ill remove(Or you can) it but it was easy to find and get
Done some digging and fixed my problem and for those that may be having a problem downloading server textures goto your .Minecraft folder and make a folder called "server-resource-packs" as the minecraft cant and crashes as a result..
I like the idea, MCMMO is a great plugin. Although it only supports vanilla tools, but the plugin's config allows you to add tools so it might take some time to configure aha but great idea! :D