Hello guys I am having a trouble

I am trying to create a series of curves on multiple surfaces by (curvebyparameterlineonsurface) but first i need to define its (uv parameters)
image but i’m having this trouble

the full code

You’ll need to move from a polysurface to individual surfaces as that erroring node requires a surface, not a polysurface as the first input.

Filtering the surfaces by testing for intersection is one possible way to do this.

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