Roman Chariots

Hallo! I'm new here and firstly apologize for my English. I wanted to add Julian chariots for roman army. (Julians only) I've read the tutorial and almost finished the unit. I used the barbarian heavy crew for the heavy chariot and changed the texture of the crew. First problem was that the crewman was running in front of the chariot. Ok... I fixed it. Everything worked propery next time when I played the battle, but after few seconds the game is switching off by it self.

What should I do? :help: