Invalid brep

[Dmitry_Korchemny]

Hi everybody!
I want to loft edges, in result I want to create brep.
But I have some problems - Invalid brep.
I will be glad of any help

Error 05-10-23.gh (6.6 KB)

[Quan_Li]

The curves.

[martinsiegrist]

I think I’d get rid of the near duplicate curves and loft what’s left.

At least two curves are nearly coplanar and those are part of the reason why loft fails here.

maybe 05-10-23.gh (13.3 KB)