What should I do if I see a 'Supply problem,' 'Incompatible cartridge,' or 'Unauthorized cartridge' error message?
Take out and reinsert the toner cartridge to resolve the error. If the error still appears after reinserting the cartridge, visit www.hp.com/support/ljM255 for further assistance. (Page 8)
From the official HP Color Laserjet Pro M255 M256 Printer manual, page 8
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