Thought I'd give this another try in the latest build, but same error.
Newt, are you using any plugins that may not be installed on my machine?
Can't see why it won't work.
Lost, did you get it to work after?
In my case it was because I had kept an older version of the path behavior, along with the newest version. At least that was the problem with another one of newts, so I suspect was with this one too. Removing the older one fixed it.