How to solve the exception: The input type is not a subclass of Element

[gnab]

Hello, I'm trying to get all unused connectors in document but I'm getting the exception:

How to solve it?

[sahin.ikbal · Accepted solution]

It's Named "FilterElementCollector" it can only access the Revit Objects which are inherited from "Element" class or "Element" itself, Connector is not a Element so giving this inside the Class Filter obviously will through an error.

You need to enumerate through the elements and extract their connectors to get them all. 

[gnab]

Thanks for answer, I have already understood. I filtered FamilyInstance elements and then got all unused connectors.