What is the M72 error message and what does it mean?

Can you explain the left label discharging machine operation and what actions to take when it times out?

What is the machine code of the label discharging machine, and where can it be found in case it needs to be
"The left label discharging machine has experienced a timeout Error M72. For assistance, please verify the label discharging machine's operation and adjust settings or contact system support for further troubleshooting."