Print service error 808 followed by a 372 error

I think I have encountered bug error report on my printing service. I'm using XenApp Fundamentals 6, which is installed on my windows 2008 R2 Server, SP1. I also have Citrix Hotfix Rollup pack 1 installed. I use Citrix Universal Print Driver because I don’t have any print drivers installed in this server. I often receive an error message when a certain user tries to connect. Here is the error message:

 

The print spooler failed to load a plug-in module C:Windowssystem32spoolDRIVERSx643Cpupdui.dll, error code 0xc1. See the event user data for context information.

 

Log Name: Microsoft-Windows-PrintService/Admin

 

Source: PrintService

 

Event ID: 808

 

Level: Error

 

User: MAGNETJohnr

 

OpCode: Spooler Operation Failed

 

Task Category: Initializing

 

Keywords: Print Spooler

 

And an event log pops out with this error:

 

The document Order Entry.RVENDORPOLaserMaster, owned by John, failed to print on printer EPSON TX121 Series (from MAGNETPC) in session 3. Try to print the document again, or restart the print spooler. Data type: NT EMF 1.008. Size of the spool file in bytes: 393216. Number of bytes printed: 304680. Total number of pages to the document: 2. Number of pages printed: 0. Client computer: XENAPP. Win32 error code returned by the print processor: 2147500037. Unspecified error

 

Log Name: Microsoft-Windows-PrintService/Admin

 

Source: PrintService

 

Event ID: 372

 

Level: Error

 

User: MAGNETJohn

 

OpCode: Spooler Operation Failed

 

Task Category: Initializing

 

Keywords: Classic Spooler Event, Document Print Job

 

I would like to know what could have caused this even if the user does not report any problem in printing the document. Can you tell me any solution to this issue? Any effort will be greatly appreciated.

 

Thank you!