..say what?

I have no idea what this means. My game cartridge is not damaged in any way, and other than being dropped a few times, neither is my GBA. I had two save files on the game, one being around 84 hours and the other being around 76. While I have a sneaking suspicion that perhaps the files are too large, I can't be certain. The game won't allow me to load, save, or delete anything, instead I get the message "Error in backup memory."

Does anyone know what's wrong? Can it be fixed, or am I royally screwed?