How can I fix this error Canon MP287 Error Message: The printer's cover is open. Close the cover

SOURCE: my mp600 keeps saying close inner cover-which is closed

I had the same issue, turning off didn't solve it.
There's a plastic flap the width of the print tray just inside that I flipped up and it solved this problem. It is directly in front of the ink tanks. I'm assuming we flipped it down and forgot about it. It seems it needs to stay up, although you wouldn't notice it when it flips down when you close the top, as it closes just fine with it down. It's easy to overlook. This took me a few hours to realize.

The top of the flap has a half circle cut out of it in the middle.

SOURCE: error message inner cover is open canon pixma mp610 printer

Had the same problem myself but discovered that I had previously moved the inside flap down when I put the ink in. I moved this back into position and bingo! (If you make sure all the covers are closed then look into the printer where the paper exits you will see the flap that moves up and down, this must be in the up position)

SOURCE: Error: "Back cover is open. Close back cover."

We had this problem. It turned out there was actually a piece of paper stuck in the printer! It wasn't so easy to see it from the rear.

We removed the paper from the front by taking out the ink cartridge first. Turned the printer back on and everything was fine.

SOURCE: Brother DCP 7020 error 'back cover open close

• Open the back cover.
• Pull the flap down that hides the orange roller on the fuser (be careful: it's hot)
• Locate the inner flap that runs from the centre to the right hand side.
• 3/4 along the right hand side, there is a tiny little perpendicular appendage on this bar that should sit in a slot. Locate it properly and the error will go away. You can go that by slightly bending the slot if fits into on the inner flap. The appendage can get jossled out of the slot when one is removing jambed paper.
  

Ricky brashear

• 176 Answers
• Posted on Jan 28, 2011

SOURCE: Message on my window: Error -

https://www.canon-europe.com/Support/Consumer_Products/products/Fax__Multifunctionals/InkJet/PIXMA_MX_series/PIXMA_MX870.aspx?faqtcmuri=tcm:13-716137&page=1&type=faq

here is a website that tells how to correct jams and also shows some pictures of all the door openings, It sounds like the cover that holds you bulk paper, sometimes there is a lid on top of it. it may not be seated properly.
hope this helps