We all love games and we all love Steam. Every once in a while, we receive errors that drive us crazy such as the Failed to start game with shared content. Please update these games first:
This stupid “failed to start game with shared content. Please update these games first:” error can happen for any number of games. Often times, you’ll find this associated with the Call of Duty series. I most recently had this happen with Advanced Warfare.
The fix that works for me every time is to verify the integrity of the game cache: