Duplicate along Edge - Blender 2.8

Created by: morph3us-net

Problem statement

I tried to follow thew first part of this tutorial: https://www.youtube.com/watch?v=tXhkhTlgd4s

The "Dupliacte objects along edge" node however turns red and there is no output. I use Blender 2.8. Please see my screenshot here: https://ibb.co/0Vmm9Xs

Expected result

I wanted to have an array of boxes following the path. (I am trying to make train tracks.)

Actual result

No array of boxes following the path. :(

Sverchok version

0.072

I followed this tutorial for installation: https://github.com/nortikin/sverchok/issues/2326

Am I overlooking something stupid? Thanks in advance! :)