Hi Sonya1,
I just checked and the paper size mismatch error occurs both if I copy a document using the ADF as well as if I send a print job from my computer.
I am using A4 paper (210x297mm). Both the printer and computer are both configured for A4 paper.
I have the printer set to A4 plain 2 - as I'm using an 80g/m2 paper.
Thanks in advance for any further assistance you can give me.