asterixx

Hi, I have an AR DSi I use with a DS Lite and Pokemon Black. I've tried a couple of the CodeJunkies codes and they work fine. However, when I try to use other codes (like the one for Entei or Liberty Ticket), I get error messages. For Entei, when I try to go to the box it's supposed to be in, I get a black screen and "An error has occurred. Please turn off power." At which point, the box is no longer accessible so I have to start the game from scratch. Is this "normal"? Can someone shed some light on this little problem? Thanks!