Cause

Paper size that is not compatible with automatic duplex printing is specified.

What to Do

The paper sizes suitable for auto duplex printing are A4, Letter, A5, and B5.

Press the printer's Stop  button to cancel printing.

Then change the print settings and retry printing.

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.

Or if you still need help, visit our Canon Community by clicking the button below to get answers:

____________________________________________________________________________________________