We’ve just a put out a fix. There was a file that got missed when you were putting out the update. If you are on Steam, you will need to close the game and make sure you get the update.
@Nimhain, I closed the game and relaunched but it’s still giving me the error message. I also verified the game cache and then tried, same thing. Edited~ Tried it a third time and it worked, sorry about that.