client-error-not-found (0x0406)

   The IPP object has not found anything matching the request URI.  No
   indication is given of whether the condition is temporary or
   permanent.  For example, a Client with an old reference to a Job (a
   URI) tries to cancel the Job, however in the mean time the Job might
   have been completed and all record of it at the Printer has been
   deleted.  This status code, 'client-error-not-found' is returned
   indicating that the referenced Job cannot be found.  This error
   status code is also used when a Client supplies a URI as a reference
   to the Document data in either a Print-URI or Send-URI operation, but
   the document cannot be found.

   In practice, an IPP application should avoid a not found situation by
   first querying and presenting a list of valid Printer URIs and Job
   URIs to the End User.