I downloaded Ver. 7.1 and am now getting an extra page when I print. It says "PCL XL Warning IllegalMediaSize" How can I stop it from happening?

Is there are way to prevent the second page from printing, with the error message?

I get a similar message if my printer picks up a second sheet of paper part way through picking a sheet. That is a paper/printer hardware issue but you might be able make some changes: keep the paper dry (and the printer in a dry place), ruffle the paper fully (bend the stack in a U downwards and upwards) before loading it into your printer, don’t let the paper run out during print (it is often the last and second-to-last pages that get pulled through together). Cheers, Al

If it is not pulling through a second page then this question and answers from HP seems to explain the problem and provide paths to solutions, or workarounds.