Network Surface - At least 2 curves are needed in the U direction


I am trying to create a surface via the box " Network Surface" on Grasshopper but I have a red flag mentionning “At least 2 curves are needed in the U direction”.

I don’t understand this problem and was not able to resolve this untill now given that I input 75 curves in the U direction of the box " Network Surface".

Do someone know how to solve this ?

I have attached the grasshopper file and a .3dm illustrating the surface that I am trying to reproduce.

Thanks for the help,


Flatten the ‘U’ input to NetSurf.

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Thanks for the help Joseph.