nervchild

sorry if the answere to my question has been posted somewhere else but im new here. infact i made an account to specificly ask this question. i am on spartan ops and i have played the first 5 chapters every episode. for some reason it says content unavailable for anything on or past the sixth chapter. i dont know why. can anyone tell me what the problem is and what i need to do to correct it. i thought i had to watch the cut scene to make it available but still, nothing. any help please. thanks.