Wont play

Hi all, ive downloaded Wall-e to play on my ds but it wont play, all i get is the start up screen and then it says switch off and romove card then try again!! :-\
Any ideas .cheers

What flashcart are you using? Update your firmware by going to http://www.linfoxdomain.com/ds/

Replying to #2

Superb info cheers