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Do you have a full roll of paper loaded?
Sometimes a new full roll does not fit in correctly and the sensor does not detect the paper roll;
Can you check that the sensor is clean and the paper roll is pushed in fully?
You can fit a label over the sensor to fool it into seeing a roll at all times.
If that doesn't work then there is a fault with the sensor.
Not in the settings, however you can fit a label over the sensor to fool it into seeing a roll at all times.