I go to play Reach and....?

Ok so here's how it went i turned on my Xbox and Signed in put reach in Etc.... And it says " Welcome to Reach choose Your Gender " So I choose my Gender Then it takes me to the Armory And i still have all my armour rank challenges Etc.... So then i go to play campaign and it says " Players Failed To Load Content " Then i go to choose a different mission and it only shows Noble Actual. Can Someone Help Me? Matchmaking And Firefight Still Works Just Not The Campaign. I Have Had The Game For Awhile And It's Installed To My Xbox.