Loft doesn't work

Hello,
I am trying to loft the venation one curves and look like a pattern on a flat surface with a little bit of thickness, but it is not happening. Please help me out.


curve.3dm (45.2 KB)
top lines.gh (38.6 KB)

See in Merge result if they are paired.

missing

They seem to be paired and both of them gets selected.

Nothing here.