Hi

Error CE-34878-0 is a general error code that appears on the PlayStation 4 when the system is having trouble running a specific application or game. There are a few potential solutions that you can try to fix this error:

Restart your PS4: This is the most basic troubleshooting step and often resolves the issue.

Update the game or application: Make sure that the game or application you're trying to run is up to date.

Check your storage space: Make sure your PS4 has enough storage space to run the game or application.

Check the game or application's compatibility: Some games or applications may not be compatible with your PS4's firmware.

Rebuild the PS4's database: This can help to fix corrupted data on the PS4.
Reinstall the game or application: If the above steps don't work, try uninstalling and reinstalling the game or application.

Check for hardware issues: If none of the above steps work, it's possible that you may have a hardware issue with your PS4. Contact Sony for service.
It's worth to try those steps one by one and check which one works for you.