Whenever new content or updates are available, it is important to allow these packages to download completely before playing the game or accessing the new content. New content includes DLC packs, title updates, console updates, and compatibility packs. Attempting to play the game or access the content prior to completion of the download can cause errors that may require the uninstallation and reinstallation of some or all of the content.
Please note: If you purchased The Resistance DLC Pack or the Season Pass but haven't downloaded and installed the DLC pack, you will still see the DLC Playlists in game. This doesn't mean your DLC pack is installed. You'll need to back out of the game and install the DLC pack before it becomes playable.
You can verify that the DLC pack has fully downloaded before playing.