Actually a better plugin for someone who writes plugins would be a UI that shows all current .dwg layers and next to each layer is a tag selection box. this would allow me to move thru reassignments with ease. But even better would be that every piece of geometry then gets grouped and tagged with the new SKU tag and the geometry within is assigned to "untagged".

@panixia
Normally that is my workflow as well. Everything goes to "Untagged".
In this case, I got a .dwg site plan with all kinds of information and the existing tags were the only way for me to know what was what.
So I was picking each tag, selecting the geometry, re-tagging it to "Untagged" and then grouping it and putting it on my own tag system.
There was a 2d topo map that I did convert but they also provided an elevation accurate set of topo lines that forgot to process. I just grouped it and then went straight to toposhaper. I was in a rush I think.
That group was also inside another group. Solution was as @fredo6 said, put the group by itself, fixed the geometry tagging and then run the tool. Have a nice healthy terrain now.

Update:
@fredo6 - Tag issue was it. Was given the file from an architect and thought I had caught all the issues. This last group didn't get the geometry tag reset to "Untagged". As soon as I did that. Tool worked. Thanks!

@fredo6 I have the topo lines in a group and that is inside another group. If Im inside the mother group and laugh topo will I get the error?

Thanks @rv1974. Will try that and if don't get a good result and I will post the file.

Working with Toposhaper in SKU 2024 & 2025.

Have latest updated LibFredo6 15.4a and last version of Toposhaper 2.7a.

Im working on a M1 MacBook Pro with Sonoma 14.5

The UI doesn't look at all like Im seeing in all the images and Im getting errors about cleansing that I don't understand.

I have watched a few videos now on YT and im just not getting the same experience that the video shows. I have tried in 24 & 25 and both have the same issue.