Can't get memory card to work for Animal Crossing

[zergling50]

The game runs fine, but it keeps saying that the memory card cannot be found instead of asking to reformat it. I could use save states, but since Animal crossing is a game that relies on the current time a lot save states mess that up. When I try using the MemCard manager it says that the memory card file that came with Dolphin is not big enough to be a valid memory card file. I'm not sure what to do. I'm new to dolphin so I apologize if I'm doing anything stupid, and thanks in advance for any help. If you need more information on something specific just ask.