It seems to be an import error when importing models in the level editor. I'm assuming you ran ace1.exe and it just gave you that? GameGuru uses an encrpytion method to stop people from taking each other's assets, but I've never seen that when just booting a game. If you can contact me at 3VET#1861 on discord, I will try to help you fix that so you can get to playing ASAP.