Harry Potter and the Half-Blood Prince : a big problem !

Hello,
I downlaoded the last Harry Potter's game. ;) I lauded the game, I choised my languague (french). But when I'm on the menu, I have this message "The save data could not be accessed. Please turn the power off and reinsert the DS card" (in french, off course).
After, I turned off my DS and I reinserted the card but I have the same message. :'(
Can I have some explications or help for my problem :-[! I had downlaoded some others DS' games and I haven't got this problem.

update firmware.https://www.romulation.org/forum/index.php?topic=1462.0check it.

Thank !