Probably simple, but hard to find/understand why there is this difference.
I have a list of points and with “list item” + index use a part of them to create polyline. Works fine
I do the same to make a line, Error.
No idea what is causing this different reaction (or how to solve it).
Hey Eef -
The Line parameter doesn’t create geometry, it holds lines.
The Polyline component can create single lines as well, and you could just use that one. Alternatively, use the Line component.
-wim
Guess I found my own error 
The Line component was the wrong one (data: collection of lines). And that expects a list of lines.
The regular line compoment does want two points as input. Needs more components.
I think I best solve it with a second polyline component.
Thanks Wim. I stumbled over my own error as you were writing your answer
