HELP PLEASE ! My printer says it has a paper jammed in there but I dont see any ?! WHAT ELSE CAN I DO ?!?!?

I need to print something from my printer ( My printer is a Canon MP280 series Printer ) But it keeps saying there's jammed paper but I dont see any in there. What else can I do cause I need to print it for school !
Update: If there is a jam paper when can I find it without breaking the printer ?
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