Revit 2017.2. Dynamo 1.3.
Graph is pretty straight forward:
Collects all Walls, finds those only on the selected level. Then i am grabbing the Unconnected Height and writing it to a parameter. That all works fine. Then i remembered there are model groups on the level, so i need to exclude those.
The sections in Green were made by someone else for another graph i have, and they work fine in that graph. But, when i put it in to this graph, i get the ugly Unhandled Exception every time i run it.
Naturally, it also isnt working, when i run it.
I can run it and blow away my groups (instead), but thats obviously less than ideal. There are a LOT of Groups in this project.