Sweep2 via VB.NET

Hello.
I'm having some trouble with a sample .NET script so kindly posted by Rajaa Issa on the mcneel wiki (http://en.wiki.mcneel.com/default.aspx/McNeel/GrassHopperGallery.html). I've attached a sample grasshopper solution and accompanying 3dm file - the same rhino geometry works with the builtin "sweep2" node, but not with the .NET script node. I suppose this must be due to some argument set (or not set) in the script, but without documentation I can't fathom what. Any help would be most... helpful.
Thanks!
Kyle Steinfeld