constance - 2007-01-19

I installed the contactsheet x into the photoshop directory as listed in the pdf.
adobe/photoshop/cs2/presets/scripts. I installed both files into this directory.
When I try to run the script in Photoshop I get an error message 21 which says
undefined in not a object. Line 7349 exec. 109 ( file parent. to L1 string ()+ does not exist changing to +

What does this mean and what am I doing wrong?