Vector by two points not working

Hello,
Is there a reason why this node is not working? I am pretty sure I am trying to do this right.
Thanks!

It looks like you’re using a curve parameter (a double between 0 and 1) instead of a point (x,y,z or other representation). Without knowing the rest of the graph, try converting the parameter back to a point with something like Curve.PointAtParameter.

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