SATO CL4NX Operator's Manual page 722

Error Message 1019 (RFID System Error) (CL4NX only)
When there is an error with the printer, the error message appears on the screen.
Check the cause and countermeasure, and then take appropriate action.
To clear the error:
Power off the printer.
Cause and Countermeasure
Cause
RFID module is not operating correctly.
Countermeasure
Repair or replacement of the RFID module is required. Contact your SATO technical support
center.
Contact Information for When You Are in Trouble
722