Modded Late Campaign Turn 5 Crash

[Chamchamcham]

hello,
i have modded bftb to include another faction: serbia.
i have also removed the republic trait system, because it caused errors to me.
i can play the late campaign, but before turn 5 starts it crashs (between rebels and me) saying that medieval 2 has encountered an unspecified error!
can you please help me (error log just says the mentioned before)

[Chamchamcham]

here are the thngs i have changed:
- serbia included
- regions changed
- new judaism religion
- new buildings
- all factions are hording after lost of last settlement
- campaign script lowered (ai support agents+troops removed)