Playing Driveclub is impossible now with thanks to this error code. As PS Support suggests, I have my system updated, the game software updated, initialized the PS4 and also tried deleted and re-installed the game. I even bought a second physical copy of the game AND a digital copy too.
Playing an un-updated copy of the game offline is impossible too, as it prompts me to update the game.
Does anyone have any other suggestions for my problem?
Solutions to the error code: http://community.eu.playstation.com/t5/PS4-Support/Error-code-CE-34878-0/m-p/20287161