Can you help me with this error?

Can you help me with this error? I download the games .Nd's files but when I try on the DS said "The save data could not be accessed please turn the power off and reinsert the game card”. What I can do? I use the DS R4 2GB micro DS

When does this appear? When you click a rom, if so your card probably needs formating. Copy all accross and use Panasconic SD Formater.
http://panasonic.jp/support/global/cs/sd/download/sd_formatter.html

Deepens on the game you are trying to run ?, If it a R4 original DS, try the DSTT v1.17a12 firmware For R4 Originalhttps://www.romulation.org/forum/index.php?topic=27617.0

This appears when I take the game on the menu games. Like try to open the game and after that the message on the screen "The save data could not be accessed please turn the power off and reinsert the game card”. But it's happening with all my downloads. I used r4 revolution for DS

Try copying over the firmware again and if thst fails copy everyting over to your computer, format and copy back.Make sure that if it doesn't say r4ds.cn on the box/card don't get it from theer or use the DSTT one.

r4 revolution for DS, If its not SDHC type R4, Try that firmware ^DSTT v1.17a12 For R4 Original , (Note) Self Boot ysmenu.nds not required, Updated 12/27/09http://www.mediafire.com/download.php?f0itmtdty5m1. Backup your Games and Files onto a spare folder on your desktop
2. Format your micro sd card , how to... click right on the letter drive your microsd card is using and see format, and then format it in fat32... this will wipe clean your micro-SD card
3. Download files abouth and unpack files from rar archive onto your microsd card, if you need winrar download it hear http://www.rarlab.com/
4. Place your games in the NDS Games folder, Put back into your ds and runRoot folderTTMenu folderNDS Games folder

I really appreciate for you help... I get it. Thanks so much...