Canon USA has a down loadable file for the manual.|
Here is the link.
Here is what is being said of this error on the forums:
Fixing this error is much easier as it looks. Unplug the printer completely. Move the ink cartridge cradle gently to the left. Over to the right at it's usual resting place you will see a small pad about 1cm square. This pad and the area around should be covered with ink. Get a microfibre cloth and press down on this pad - it's not fixed so should come away with the cloth, otherwise use tweezers gently. Squeeze the pad several times between your thumb and forefinger while inside the microfibre cloth to remove ink build up. Then when not much ink comes out on the cloth, clean the area in the printer around the pad so that looks free from ink too. Then position the pad back in place, move the cradle back into position, plug in and switch on - should work fine now. But it's worth checking for any paper caught near the ink pad