QTR-Quadtone RIP

I'm using an Epson 9890. I keep getting an error message that says the paper is loaded incorrectly when I try to load a sheet that measures 44x61.75". I just successfully printed on a cut sheet 44x54.75" and am using the same method (the one indicated in the manual for large cut sheets). Is there a limit on length that's not mentioned in the documentation?

Thanks,
Heyward