Printing to Epson from iMac on Roll paper

[Menachem]

I am totally unable to print from my iMac 5K, iOS version 10.14.2 to my Epson SC-P800 on 17" roll paper.

I receive the following message:

A roll paper is loaded, but the paper source selected in the printer driver is not appropriate.
The print cannot be continued.
Please match the paper source setting of the printer driver to the loaded paper in the printer.
To print using the paper source setting in the printer driver, remove roll paper and then load the appropriate paper.​

I attach the settings I am using. This is from the Epson Print Layout program, v 1.3.7

I have no problems printing to the sam setup in Windows.

Thanks,

Menachem