Greetings,
The error indicates there is a jam, obstruction or communication failure.
This is the first steps:
Canon : PIXMA Manuals : MX920 series : 5011
Which doesn't always resolve the issue.
The next thing to do is look for an obstruction or jam. Canned air and a flashlight might be helpful here. This can be a corner or ripped piece of paper, or something that has become trapped or lodged under the printhead. For this, I would remove the ink cartridges and the printhead. Inspect and reassemble, then reseat the inks. Reconnect to power and test.
If that doesn't work the issue is not going to be something you can fix on your own. You can contact Canon and decide if you want to go though packing the printing up for shipping, schlepping it to a repair facility and paying for diagnosis and repair..., or simply replace it.