Export G-code error

I loaded one of my stl files into Printrun (experimental version), an stl I exported from ZBrush of a female torso… one shell… mesh integrity reports no errors in ZBrush.

Stl loads fine into Printrun, but when I try to “Export G-code” I get the following error (see pic).

I checked, and I’m missing the subfolder "Slic3r"under my installation directory (see the missing path in the pic):
…\Printrun\Slic3r\lib\std

Should this dir exist and where can I get what’s missing?

Thanks… any help appreciated!
Paul

I did load my torso stl file into the stable version of Slic3r, and it exported with no errors. The file looks good in edit mode… will give it a go next.