Cause
Paper size settings at printer driver do not match the paper size registered in the printer.
What to Do
Press the printer's Stop button to cancel printing.
Match the paper loaded in the rear tray with the paper size registered on the printer using the printer's Paper Select button.
Specify the paper size registered on the printer to the printer driver, then print again.
If the paper size loaded in the rear tray is larger than the paper size set at the printer driver, you can continue printing without changing the paper size settings. Press the printer's OK button.
Learn about the paper sizes that can be registered in the printer using the printer's Paper Select button.
You can disable the function to prevent printing error. When this function is disabled, the printer uses the paper settings for printing onto the paper in the rear tray regardless of whether or not the paper matches these settings. This can be adjusted from a Windows PC or Mac.
If your product issue was not resolved after following the steps above, or if you require additional help, please create or log in to your Canon Account to see your technical support options.
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