game genie was an adapter you put your cartridges into, then put both in the console back in the old days. You would then enter a code for whatever cheat was available for a game. On the emus, you can enter these codes into that folder, and when the game comes up, you can use the cheats. Fceu was looking for codes when the error occured. It's a neat feature if you want an easy way to beat games or want to unlock anything. Fceu is for the NES. I just need to fix my genesis emulator. Thanks for the help!