Random Spawner Giving Errors

Hi, I am having errors with MythicMobs and the Random Spawning System. It may also have something to do with Libs Disguises, but I'm not sure what the problem is and how to fix it. Thanks, Phillip

Here is my server log for the error. If any additional info is needed, I'd be glad to provide it.
http://pastie.org/private/24sy5nsxhzktq2xifrsiw