Before we get to the remedy for the Canon printer not printing error, let’s have a look at the reasons why you’re having this problem in the first place.

• Print tasks become trapped in the queue.
• Due to a paper jam,
• Canon Printer Drivers become obsolete.
• Paper placed in the printer that isn’t the right size
https://www.canonprintersupportpro.us/blog/fix-canon-printer-not-printing-issues/