World won't load

Hello, I have a world which i am trying to play on, that won't load. the screen turns white for a bit then it crashes. The world worked fine in 1.8.0.8 beta. it currently has 1 addon, just changes a few things on bunnies and cats. experimental & education features are enabled. i hope you can fix it.

 

UPDATE: the behavior pack is causing the crash. disabling it makes it work fine, but the cats are a bit glitchy. how can i enable the pack?