Here is what you likely need to do, broken down by what those words mean in practice: You probably want to stop the "Print Spooler" service (often referred to as the "spool" or "net spooler") so you can clear stuck print jobs before preparing paper.

net stop spooler

The phrase is not a standard Windows or networking command. However, in the context of "prepare paper," you are likely dealing with a printer spooler issue.