Medieval 2: Total War encountered an unspecified error and will now exit.

[DMC]

I'm playing whit the England Fashion in the late campaign of the SS4 and at some point of the game I turned against the papal states and so i was excommunicated.
When i try to fight a Cruzader army in Real time battle, the game gives me a unspecified error and then closes. please could somebody help me?
Sorry for my bad English

[Cloud.]

If you're game gets a CTD just before you enter the battle, try moving around some other units, agents, and then come back to the battle. Or, change the unit composition of your army and see if it works.