Can't besiege Goblin town as the Silvan elves, once my army gets there I start the siege, click end turn, and before all the other factions make there moves I get unexpected error occurred and then if I try to reload auto save unexpected error occurred, I have had troubles with other sieges where I couldn't fight on the map so would have to auto resolve but I can even get to that point with goblin town any thought or work around?