problem with downloaded ds game

just downloaded ben10 ds game but all i get is the save data could not be accessed please turn the power off and reinsert the ds card please help

How are you playing the game. Emulator or Flashcart?

not sure what u mean?

Are you playing it on your Computer or on your DS?

on a ds have some games all ok just this new ben10 game is giving trouble..

What is the name of the card you are using to play the downloaded games?Full name and website off the box if possible