Not sure Whats wrong... ( or if this is in the right place..)..

..recently, whenever i try downloading games for my DS, it just shows up saying " Data could not be found, please turn off your DS and reinsert your DS card ".. But It Still wont work :( :( :(I Did un-zip them ( or whatever it is called..) and i also tryed re-downloading them and doing all the steps again..??!! ??? ???Can Someone help..?? thanks..!

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