In my very first game, 56 slow turns in, I get this message when I try to end my turn, "Error:NullReferenceException. Object reference not set to an instance of an object." The game then just hangs on the same AI's turn, and the screen starts to fade to a light brown color. Trying to submit a bug report in game just gets its own failed to send error. Anyone have an idea what this means or how to get passed it?