Sony has a recommended solution for the Error CE-34878-0. The alleged solution is as follows:

"If you are experiencing this ce-34878-0 error code, please close the application and then install the latest system software and game patch. If the error occurs again, initialise the PS4 system after back-up of the save data and please also submit any crash reports after re-booting your console when the error occurs."

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A PlayStation 4 error has been corrupting save files for many users, resulting in hours of lost progress and, in some cases, has prevented any apps from being opened on Sony's console, according to a 35-page PlayStation forum thread Posts on the thread identify the problem as Error CE-34878-0. Users report the error occurring with files relating to FIFA 14 , Assassin's Creed IV: Black Flag, Call of Duty: Ghosts NBA 2K14 and Battlefield 4. One user lost 30 hours of progress, he told Joystiq , because of the error, while many others on the thread can't open any of their consoles' apps, rendering them useless.Although some users write that deleting the files in question allowed the apps to be playable, many other users say the process doesn't solve the problems –– according to the forum, no singular solution has been found.

Mike Mahardy is a freelance writer for various outlets. To hear him rant, you can follow him on Twitter