Hello alphapagine,
The paper size that you are trying to use is outside of the limits for this printer. The maximum size that this printer can handle is 457mm (18in). You can try to run this paper in the machine, but you will most likely get an error/jam because the machine will be expecting a shorter sheet. I have copied instructions from the Knowledge Base for you below on how to create and use a custom paper size but you may be restricted to 457mm.
1. Open the file to be printed, and then select [Print] from the File menu.
2. Select the required printer, and then click on the [Printing Preferences] or [Properties] button. The Printing Preferences or Properties window will be displayed.
3. Click on the [Paper / Output] tab.
4. Click on the Paper pull-down menu.
5. Select [Other Size]. The Paper Size window will be displayed.
6. Select the required custom paper size from the Output Paper Size pull-down menu, and then skip to step 10. If the required custom size is not displayed, continue with the next step.
7. Create the required custom paper size.
1. Select [New] from the Output Paper Size pull-down menu. The New Custom Size window will be displayed.
2. Enter a name for the custom size in the Name field.
3. Enter the height of the custom size in the Height field. This may be set from 210 mm (8.27 in.) to 457 mm (18 in.).
4. Enter the width of the custom size in the Width field. This may be set from 104 mm (4.1 in.) to 320 mm (12.6 in.).
5. Select either the [Inches] or [Millimeters] radio button from the Units section.
6. Click on the [OK] button.
8. Select the newly created custom size from the Output Paper Size and Original Document Size pull-down menus.
9. Click on the [OK] button.
10. Select any other required print settings from the Paper / Output, Special Pages, Color Options, Layout / Watermark, or Advanced tabs.
11. Click on the [OK] button twice to send the job to the printer.
