Canon PRO-100S series Online Manual page 574

2103
Cause
The printer cannot detect the paper size.
Action
Press the printer's RESUME/CANCEL button to dismiss the error, then try to print again.
If this error still occurs even after printing again, set the printer not to detect the paper width by using the
printer driver or Remote UI.
Note
• Depending on the type of paper, the printer may not detect the paper width.
Additionally, if the top cover is opened while printing is in progress, the printer may not detect the
paper width.
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