Canon PRO-500 Series Online Manual page 750

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Cause
Printer cannot detect paper size.
What to Do
Press the printer's Stop button and retry printing.
If this error still occurs even after printing again, set the printer not to detect the paper width using the
operation panel, the printer driver, or Remote UI.
Note
• For more on setting printer not to detect the paper width using the operation panel, see below.
Paper-related settings
• Depending on the type of paper, the printer may not detect the paper width.
If the top cover is opened while printing is in progress, the printer may not detect the paper width.
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