Strange crash issues?

Heyo. I'm not sure if this is the correct place to ask for help with crash issues, but I can't seem to get the game to work correctly. It's crashing every time I try to create a world. (Large/Expert). It barely even gets past the first operation before crashing. It usually isn't giving any crash log at all, but after about 6 attempts it finally gave me this:http://puu.sh/p4Ph7/51e0d1fce4.png

My (enabled) mods are: Thorium, Tremor, Prefixes for enemies, and RPG classes mod

My...

Strange crash issues?