GBC and NES. Haven't had any troubles with GB or PC-Engine (yet). GBA runs fine. The strange thing is that I've never experienced "an error has occurred" with any VC game before (as I reminder, I was on sysNAND 9.2/emuNAND 10.7 with A9LH and AuReiNand and I've never had any issue).Which kind of VC game are you trying to run?