I had this totally annoying problem this morning. After looking for any obvious paper jams or small bits of loose paper, I tried several fixes: 1) open front cover, release levers that hold white rollbar in place, roll the bar forward to make sure nothing is stuck behind it, snap levers back in place; DID NOT fix the problem; 2) open top cover, remove print cartridge, look for jammed paper bits, close cover; DID NOT fix the problem; 3) unplug the machine, wait a few minutes, turn machine back on; DID NOT fix the problem. I even unplugged the machine, opened ALL the covers, turned the machine upside down and shake it to see if any paper clips, staples, or other objects have fallen inside the machine; DID NOT fix the problem. FINALLY, I pulled the paper feed tray forward, reached down to the feed rollers, twisted them a few turns, put paper back in the machine, and the "paper jam" message disappeared! This may not work for everyone, but it worked for me today, so I hope this helps someone out there to have a better day.
two or three pages feed in at all the same time
canon b155 paper can't pass through for making a copy