Unfortunately my Canon MG5550 (bought late last year) is doing exactly the same thing. Despite loading the paper as stated in the instruction manual, it still keeps producing "please load paper" errors. I don't really know what to do about this but am tempted to return the machine within its guarantee period. The trouble is that I might end up with a new machine doing the same thing if it is a design fault. Sorry I can't be more specific or helpful.
The Evil Within 2 review-in-progress