All Elements of Category in View giving an empty list

I am developing my first script in dynamo with no prior experience before.

I want to select 3 rooms from my model, select their boundary lines and place a fence family along those selected boundaries. The room is just made by room separation lines and not walls. I need to place a fence on the room separation wall.

Can anyone guide me how this can be done? I am using “All elements of category in view” node however it is appearing empty.

Have you confirmed the rooms are visible in your view?

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