Printing to a DNP DS40 Printer

I have a 27" iMac running OS X 10.10.5 and it prints fine. I have printed directly and also shared the printer on the Macbook Pro and it prints.

The Macbook Pro running El Capitan 10.11.1 will not print from Lightroom. Yes I know it could be a Lightroom issue but I'm using the same version of LR on both machines. The Macbook Pro will print to the printer using Preview or Photoshop but not LR. I've tried and tried. The error says, "The selected paper size is not compatible with installed media". I've used the same settings on both machines inside LR to test. iMac prints, Macbook Pro doesn't.

I'm posting here because I'm at a loss. I often am able to research online and eventually figure things out but I'm reaching out to other Mac folks.

Thanks for any info or help.

Jim