Get Type Parameter Error

Can anyone help me? I cant find out what`s missing here, I can’t get the Type mark of these walls

Not all elements have a Type Mark Parameter, Floors and Wall for example.
Try getting a single element from your list like a wall and get the list of parameters it has to confirm if there is a Type Mark parameter.
EX: Wall has a Mark Parameter but no Type Mark

I think you need to check levels on your nodes since you have 2 lists

Instances have instance parameters. Types have type parameters. If you want to get a type parameter you have to get the family or system type first.

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