Halo 3, for all who have recently played?

[Darkwatch]

Why won't rumble pit work anymore for me, it's always worked before.
Is it because I don't have the legendary map pack, because it says one or more players does not have the map needed to play, or something along the lines of that.

Help!!

 

[psyousuck]

Yah you need the legendary map pack for it, but if you do have it if your playing with a guest it messes it up.