User Activity

I'm trying to print a 13x25.5 print on matt paper. Lightroom shows my cell size as12.72x25.40. I keep getting a message that the media type or paper size are not set correctly. What am I doing wrong
Why does the printer driver software limit the length of a panorama to 26.6 inches. Competitor printers allow up to at least 38 inches. Paper companies make 19"x 38" paper.  Also longer rolls are available.