Ok... this can be disregarded. It appears my emulation drive (LB, roms, etc have their own drive) wasn't recognized temporarily and was getting this error. I've never seen it before and kind of seems totally inappropriate for the circumstances, but it's resolved and not related to LB itself. Sorry for the confusion.
This YouTube shows the error I was seeing, although it's resolved and didn't have anything to do with this problem. Anyway... it's fixed.