I am trying to recreate the animation nodes example from the online documentation that is here. https://animation-nodes-manual.readthedocs.io/en/latest/user_guide/nodes/mesh/operators/create_polygon_indices.html
I get an error at the combine mesh node (Which used to be the Combine Mesh Data Node) "A polygon uses the same Vertex twice"
I have tried fix it but couldn't. I would like to know why. Thanks. I am using animation nodes 2.1.7 and Blender 2.83.1
I have attached the Blend file.