With reference to a previous post of mine (Sverchok. Duplicating an object along a path), the linked file at that question (grille6) no longer seems to work in 2.91.0.
I've replaced the 'deprecated' Polyline Viewer with another viewer of the same name, but so far, no luck.
What am I missing?
* the previous version might have been 2.79 - I can't actually remember