Grand Theft Auto Wars

Hi i Have downloaded Grand Theft Auto Wars to my desktop and when i download it to memory card and then put it in my DS lite i get an error message saying The save data could not be accessed. Please turn the power off and reinsert the DS Card. Please help as have tried this a few times and keep getting the same mesage

Oh, here is your answer. :)
Next time use the search option before posting, ok? ;)