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

_FindP1284Key
_VSTATUS Found!
0380008000020020022c1480057c2500056;Z:007;>

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.