Create Elevation by Rooms

Thank You Alisder for that great script.

The first 3 steps works really well, however, I have some problems with Step-4, and not sure what am I doing wrong.

I am getting warnings in both ‘Manage.RemoveNulls’ nodes, which is affecting ‘BoundingBox.Contains’ & Element.GetParamterValueByName" nodes.

Unfortunately, I am new to the forum, so not able to upload screenshot.

Are you able to help please?
Thank you again