Watermark get error


I a new user of pdfcreator i using windows vista and windows server 2003

My big problem is about watermark, i download pdftk for windows version 1.41

i put exe in my directory, i change script where thare is declare costant directory.

but when i print with pdfcreator exit this error:

SCRIPT ERROR in ....AddWatermarktopdf.vds in line 50 - code 80070002 - is not possible found file


Help me please