Help with an action reply error?

When I put pokemon white into my action replay DSi and it says "WARNING MISSING CODES (3 left)" in one box. I press OK and in another box it says "WARNING CODELIST INCOMPLETE" and it goes back to the codelist. If I select pokemon white again, it says the same thing. This hasn't happened before, and it happend when I gave it to my friend. He just put the game in and it said that for no reason.