USB Printer error msgs

Hi group,
I have a problem with network printer.
I have a software which virtualizes usb ports. I connected a printer to that USB port and virtualized it into local. Now if i give a print to that printer, i am getting some error messages locally like “This document failed to print” , and also i observed some messages in WinDBG as follows


Can any one please explain me, why this kind of error messages are coming.
In which scenario this kind of messages can come?

Please help me regarding this issue.