Modbrowse

I've been trying to design a troop overhaul mod for Battania and for the most part it works. My troops appear as they should, the upgrade tree works right, etc. I am able to go into battles against other armies except for Battanian ones. When I try, the game crashes. Is there any reason why this happens? I put a party template of some kind in, but I'll admit I don't know if I did something wrong with it.