Print InCopy Document to a File (PS)

I'm using InCopy CS2 on a windows box and I'm trying to print out an InCopy Document through a configured PS Printerdriver in order to receives the ps file. For this matter I'm using VB6. The PrintOut Methode of my InCopy.Application instance takes as paramter "From", "[PrintDialog]". Now here comes the funny part. The default value of the optional parameter is set as True. Once my Script gets this far, the DialogBox is shown with my ps printer set in the printersetting. On confirmation of the print button, the ps file is generated. So far so good. But how come when the paramter of the PrintDialog is set to false, I'm always getting the following error message:
Printing Error: Problem initializing the current printer.
As far as I know, this matter was no problem with InCopy 2 or am I missing something here?
Thanks very much for any help.