I had a similar problem but in my case it wasn't that I didn't have the rise of iron downloaded properly.. the problem was one of the older dlc wasn't working properly.. think it was the Crota map pack expansion 1 from way back.. so as that wasn't installed properly or corrupted, whichever I had to delete destiny and reinstalled all the older map packs again.. the roi won't work if u bought just bought the roi dlc (digital download add on) without all the other dlc in working order.. the only way it would work without older dlc being installed and working correctly is to have the roi full game not a dlc add on