What does 'Jam in cartridge area' mean and how do I fix it?
The 'Jam in cartridge area' error indicates there is paper jammed near the toner cartridge. To fix this, open the top cover and remove the cartridge, then clear the jammed paper. Refer to the User Guide for detailed instructions, and then reinstall the cartridge.
From the official HP Color Laserjet Pro M255 M256 Printer manual, page 8
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