Rom Little Pet Shop Winter doesn't start :S

Hey,I don't know if I am in the right forum part but I just downloaded Little Pet Shop the winter version for my little sister.
But when I want to play the game I get the follow error: The save data could not be accesed, please turn te power of and reinsert the DS card?
How can I get this thing working?
Thanks!Melissa

make sure your flashcart firmware is up to date. You can get firmwares from www.linfoxdomain.com/nintendo/ds

Thanks for the help :D It works now