LadybirdBuBu

Hello. I just downloaded the NO$GBA emulator, and Animal Crossing Wild World. I put them both in a folder on my desktop. When I open the emulator I choose the game and then it sais: "unable to retreive data please turn the power off and reinsert the game card". What should I do? I got: Battery folder Slot folder AnimalCrossingwildworld.nds NO$GBA.inp NO$GBA.exe Thanks.