Hi Marco,

I searched for CNACK101 and PQT3630 in some search-engines in the internet. All answers refer to print Barcode or print with IPDS printerdevices in combination with the AFP - Parameter. I would suggest to check the printer-setup, because some 6400 dot matrix printer have an ipds-interface,
try the AUTOCONFIG feature. Otherhwise you can print any system spoolfile to make sure in which condition this error occurs.

Andreas