Just figured out that some Xerox-printers when getting a job with a unknown paper format or other strange settings. The printer will simply return the error code 016-799.
The only solution i has found for this so far is to make sure that the print jobs actually have a paper format that the printer supports. (And of course, no other strange settings…)
Pdf-files for example can in some cases have print settings embedded, so it is extra smart to check those before printing them.