no seams were defined

[loboere]

Blender 2.79b
I follow the guideline of this page
https://archive.blender.org/wiki/index.php/Extensions:2.6/Py/Scripts/Objects/HairNet/

[Jandals]

If you've marked the selected edge as a seam inside the "Grid" object, you would need to select the sphere last for things to work. It looks like you've selected Grid last.