Paper jams or debris in the carriage path.

The HP error code 0x6100004a (often searched as "610000") is a common critical failure typically indicating a carriage jam ink system malfunction

The 610000 error often hides a dirty scanner lock or encoder strip. HP doesn’t tell you this because they want you to call support.

Plug the cord directly into a (avoid surge protectors, which can cause voltage drops). Reconnect to the printer and power it back on. Printer in an error state - HP Support Community - 6544727