Found this:
The PS4 error CE-34878-0 is one of the most common errors and deals with crashed games and applications. The error CE-34878-0 (sometimes called CE-36329-3) happens due to corrupt data or system software, but it’s not hard to fix. The PlayStation 4 error CE-34878-0 fix is relatively simple, read on for the full details.
The PlayStation 4 error CE-34878-0 can usually be fixed without having to re-install the PS4 system software. Here’s what you need to do to fix the error:
Restart the system and try again. Make sure the latest game patches and PS4 system software has been installed.
If the error persists, re-install the game (re-download if its a downloadable title), and try again.
If the error still persists, you’ll have to re-install the PS4 system software. Go to Settings, then to Initialization, and choose Initialize PS4. Be sure to back up your data before doing this.
As always with games, pay attention to patches and announcements from the developer, as this might give a hint whether it’s the game that’s at fault, or if something went wrong with your PlayStation 4 console. In the vast majority of cases, re-installing the game will fix this issue.