I got the solution for anyone who has this issue in the future with this error code. My Lacerte is not on a server with multiple users, so for this case where it's on your local drive go to your local drive -> Lacerte->21tax and in that folder find the OPTION21 (or optiontaxyear) folder and simply add somethign to the name... the Lacerte IT help had me do option21.bad or something like that. This resets Lacerte and it magically opened afterwards!