CE-34878-0 Application has crashed. Restart the application in the content area. NW-31484-0 DNS server not specified. Restart the PS4 system. NW-31367-0 Could not open wireless device.

Here's how you can sort out some annoying PS4 error codes such as SU-30746-0, SU-42118-6, SU-42481-9, and CE-32753-0, and fix the issues they are causing.

PS4 error SU-42481-9 “The system software update has failed.” Curiously, this PS4 error code is basically the same as SU-30746-0 and can therefore be fixed in the same way.