Canon PIXMA MP150

Had the same problem. Fixed it by turning the printer upside down and out fell a 25mm screw. Sorted now.

I had the same error that started last night! There was no paper jammed, but after several hours of trying to get it to work, I did find a black twisty tie stuck on the roller and that was causing the problem (I have no idea where that came from!) If you are sure there is no debris or foriegn objects stuck in there somewhere, just try resetting the machine. Turn the power off, unplug it from the power source and remove the USB cable if it is connected to a computer. Then plug it back in and turn it back on. Press the start button (black or color) and hopefully that clears it. If not, look again for something stuck in the paper feed tray, also lift up the cover and look in there with a flashlight - to see if anything is wedged in there. If that still does not fix it, try calling the Canon tech support line - 1-800-828-4040. I hope you're able to get your printer working again. Good luck.

HEYY GUYS MY PAPER HAD NT CAME OUT YET I HAD TRIED ALL THE THINGS WHICH U ALL SAID BUT STILL ITS STUCKED WHAT TO DO NOW........AND MY PRITER'S INK IS ALSO FINISHED N I THINK THAT THE PAPER INSIDE IT IS NT STRAIGHT WHAT TO DO GUYS TELL ME FAST!

This same prolem has plagued many with the MP150 cannon printer, Here's what I did to fix this...E3 code shown in window
when no actual paper jam could be viewed ! I did the restart thing
by turning the printer OFF and waited (10) seconds or more, then
when I turned it back on...I listened to here the feed rollers turning
and forced feed a sheet of paper into the feed rollers..and sure enough OUT CAME a small piece of paper..actually a small strip of glossy paper like a strip that might be attached to a part during manufactureing..any way that paper has printing on it, it says;
(nitto No.500) it would be interesting to know if others out there
find the same piece of paper !! Give this fix a try. Palcando.