Family instance. Type Warning: Asked to convert non-convertible types

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Elements, Type, and Families

Hello all, I am working with the Elements, Element Types and Families. I was wondering if someone could help clear up how things are selected in dynamo and make sure I have the Revit Hierarchy correct. (Image copied form the Primer. [Capture] Using Element Types with Family Instances and All Elements of Type I get 6,072 elements. What are these elements? Using code from Einar_Raknes in post Collect all categories in a project I get 113,172 Element ID’s. Thats a huge difference in Element cou…