Konica Minolta PageScope Direct Print - Manual (Page 54)

Warning/Error Messages 10
PageScope Direct Print 10-2
This message appears if you try to print a PDF file of a version that is not
compatible with the selected printer.

Memo
This message does not appear when printing is performed using a hot
folder, however, “Error” will appear under “Status” in the Printing
Status dialog box.
For details on compatible PDF versions, refer to the support
information for the printer being used.