In the Apache error_log file on a SLES 11 SP4 server running the latest version of iPrint, I see the following entry over and over:

[warn] IPP Operation error=CLNT_ERR_NOT_FOUND, operation=Cancel Job

I also see the following:

[warn] IPP Operation error=CLNT_ERR_BAD_REQUEST, operation=0

What do I do to get fix these warnings?

After doing some Google searches, I downloaded the iPrint info tool and ran that which reported things like:

06/15/2017 11:22:14 AM, Operation Cancel Job:,
Error: 506D000C - object not found,
User Name,,
Object Name: p250cp
(Client Interface)

Looking in the iPrint manager, the printer 'p250cp' is there and is operational. Why is iPrint reporting that it can't find it???