cups-pdf: dcop print : no printer specified

[aclhkalchk]

I am using centos 5.1. Cups-pdf is set as default. I want to automate printing html to pdf. I issued the following commands:

#dcopstart konqueror http://www.yahoo.com
konqueror-7159

#dcop konqueror-7159 html-widget1 print true
error: no printer specified and (printer variable is empty)

#dcop konqueror-7159 html-widget1 print false
a dialog box pop up

#set PRINTER=Cups-PDF
error: no printer specified and (printer variable is empty)

Pls kindly advise.