I have noticed that if I wait until the game fully launches, and then click "OK" on the error message, I can continue to use the game. However, it will randomly crash and I will have to go through the process all over again. I'm just not sure what to do going forward to get this running smoothly again. It was running perfectly fine until a month or two ago when the Launcher first refused to load. At that point, I was able to launch the game from the .exe in the folder instead of using the Launcher.