Tennis no Ouji-Sama 2005 - Crystal Drive - save problem

the nds file i downloaded has a save error problem. I can paly the game with no problem but everytime i try to save, it just says save error. Is there any way i can either fix or get around it?

How are you playing it? If flashcart, update your firmware at http://www.linfoxdomain.com, if emulator like no$gba, use the newest 2.6a, and change the save type.