This is the quickest fix for most macOS users and takes under two minutes. Open System Settings → Printers & Scanne ...

It is probably the first thing you need to check before heading to the other steps mentioned below. As your printer is already showing this message, you must follow it before doing anything else.

Because of this issue, your printer might stop working or commence printing some type of unspecified thing. Therefore, you won’t be able to use it properly if your device has this issue. But don’t ...