Get Property and Set Property nodes not working

Created by: Marcus-Richmond

Problem statement

The Get Property and Set Property nodes are not working for me, but are returning the following error:

I haven't used these nodes in a while, thought I may be using incorrectly, but I tried to reproduce what is shown on the documentation and still got the error.

Sverchok version

Sverchok version 1.1.0 Blender version 3.1.2

Thanks,