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Sensor Error – Common Causes/Solutions for the Sato CL408e and CL412e
Cause: Incorrect sensor type selected on the printer and/or in the software/driver settings.
Solution: Select the appropriate sensor type using DSW2-2 on the printer.
Cause: Dirty or obstructed sensor and/or media loaded improperly.
Solution: Make sure sensor is free from obstructions and blow out with compressed air, then refer to Label Routing diagrams on the printer to properly load media.
More information is needed. What is make/ model of this printer? Is this your office/ for personal use ? Is that error occurred before? Is this under warranty?
You can call the specific vendor's helpline for what printer you have. Or contact their customer care to get more support. Here is a HP support page, https://support.hp.com/us-en/printer
You can try to link your vendor's official page & can get support.