It probably means you are out of ink or the ink cartridge is out of date. I use be be a fan of HP printers but a while back they put QR code on their ink. IF you buy in bulk when on sale, by the time you go to use it they may say it’s out of date and won’t work. This means you’re throwing away a full cartridge. There may be a detailed explanation in the manual but that’s my guess based on my experience.