Before you start canon printer troubleshooting, it’s important to identify the reason why your Canon printer is showing that error. Few common reasons why a printer shows errors are the improper connection between the devices and the network. Secondly, the printer driver you installed is not installed properly or not compatible with the operating system of your system. Try reinstalling the printer driver from an official website. You can also check the printheads if your printer is working but not printing properly. It is possible that dust is covering your print heads and therefore, they are not able to print color properly. If these points don't help you in troubleshooting the error, contact the support team for immediate assistance.