Undefined socket in Compositor

I am trying to re-implement a compositor example of T yarn knitting. I cannot find plane MK2 and UV connector as had been explained in this YouTube video: https://www.youtube.com/watch?v=AG4-sGcGyWI&list=LLuORS2hOBqsUJEgE645iWDQ&index=3&t=0s

I downloaded older blender versions, but I didnot find those nodes while search (shift+A).

Lastly, I downloaded the Github example file : https://github.com/enzyme69/blendersushi/issues/309

and I got this following error as shown in the attached image, what I should do to solve this problem.


I think you are missing Sverchok or Animation Nodes addon. Try enabling one of them and those nodes should appear normally.