r4 problem

Can anyone help please, I have downloaded the r4ds stuff and games are working except some of them say "save data could not be accessed, please turn the power off and reinsert the ds card". I am fairly new to all this so dont always understand the computer speak can anyone help and give it to me in the "idiots guide" please. Thanks :D

Please read the Common Issues https://www.romulation.org/forum/index.php?topic=1462.0 :)

Thanks i looked at that and downloaded arm7 from crackers but dont know what to do now.