Cause

Printer error has occurred.

What to Do***

Turn off printer and unplug it.

Plug in the printer again and turn it back on.

If this does not solve the problem, service is required.
For support and service options, sign into (or create) your Canon Account from the link below.
My Canon Account

***Note:  --If the cassette is pushed in too forcefully, papers may get jammed in the inner guide, and “6A80” may occur. Check the printer for jammed paper