8800 Error when printing from Javascript

i have script opens existing psd file, reads , increments serial number in text layer , sends file printer. nothing fancy there. works fine in cs3, in cs6 (win , mac) throws dreaded 8800 error. stripped down version (just opening doc , attempting print) fails well:

 

var prt_fileref = file("c:/laser/dp.100.ep_bottom.psd"); var prt_docref = app.open(prt_fileref); activedocument = prt_docref; prt_docref.print(); prt_docref.close();  

... - not complete command because of program error.

line 4-> prt_docref.print()

 

strange may seem cannot seem locate examples of print script cs6....

 

any appreciated.

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