Awens to All:
My Canon Pixma MP250 was having a constant Problem with having E03 Paper Jam Problem.
I did a Google Research for a Solution and found this on YouTube:
I tried forcing through a piece of Carboard that I took from a Frozen Rising Crust Pizza Box and some chunks of Old Dried Leaves came through.
I cleaned out the chunks of Leaves and then did a Power Down Reset on the Printer and it is now Working Fine.
I have posted a Like on this Jamaican (from the sound of her voice) Girls YouTube and made a couple of Favorable Comments.
So if you are having some Paper Jam Error Messages on your Computer Printer, just try forcing through a chunk of Carboard and see if anything that is Stuck in there gets pushed out.