Kangaroo 'Index out of range' Error

Hi. I'm trying to simply use the origami script in Kangaroo but when I go to run it I get and 'Index out of range' error.

I deconstructed a mesh into curves - Split the list of curves into A and B lists. A list curves are the valley curves and B list curves are the Mountain curves.

I'm not sure what I'm doing wrong. Any help is appreciated!