Support code 6000 on Canon PIXMA models is a paper-feed/lifting-plate error — the printer can't pick up paper correctly, often due to debris, a foreign object, or paper loaded wrong.
Work through these in order; most people are fixed by the first two or three.
Turn the printer off and remove any paper, scraps or foreign objects from the rear and cassette feed areas.
Fan the stack, don't overfill, and set the guides snug. Load into the correct tray for your model.
Wipe the feed rollers with a lightly damp lint-free cloth; some models have a roller-cleaning routine in the menu.
Turn off and on after clearing the path to reset the error.
Browse step-by-step setup guides, error-code fixes and driver help for every major brand sold across the USA & Canada.