SATO FX3-LX Operator's Manual page 453

Error Message 1013 (USB R/W Error)
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:
Connect the USB memory and then disconnect it, or tap [OFFLINE].
Cause and Countermeasure
Cause (1)
The USB memory is disconnected while writing.
Countermeasure (1)
Connect the USB memory.
Cause (2)
The copy area in the USB memory is not sufficient.
Countermeasure (2)
Make sure that the USB memory has sufficient copy area.
Cause (3)
Writing to the USB memory fails.
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