When I try to advance to the next turn, I get the following critical error (please see the screenshot linked below):
https://1drv.ms/u/s!AuPbxH5JDUrggfZoI2eJgGaErgHWfw
I have tried launching the game in administrator mode, but this does not alleviate the problem. This error has occurred with increasing frequency during the course of my campaign play-through. In the beginning, it would only happen if I tried to advance two turns without restarting the game. Now, it happens almost every turn, which, for obvious reasons, makes the game more or less unplayable.