Will it read any other game? if not, it is probably your ds that is broken, and you need to send it in and get it fixed. Your warranty will probably cover that. If other games do work, it has to be a problem with the ds cartridge, in which case you should just buy a new one. There may be ways to fix it of course, so if you can't afford a new cart you could just wait until somebody else posts an answer.
Jesus, April 2010