the online team slayer in the ranked playlist doesn't work anymore. It says "one or more players do not have proper maps for this playlist" and it has my name blinking. I have a one year gold account and it still doesn't work. What do i do?

Whenever i go to a team slayer on the ranked playlist, it says one or more players do not have proper maps for this playlist and my gamertag starts blinking. What do i do?