I should have known (putting an element id into the value when i am asking for parmeter scope box is never going to work) (it was late in the evening i supose
But know i have a bigger problem:
When i connect the Node: Referenceplane.ByLine with the Node Element.SetParamterByName the just created refenceplane is gone.
and when i stop dynamo the only thing in the view is the blue dynamo line
BTW one off the reasen i want to create a reference plane is that i whant to cut a lot off structural framings (its not the main reasen but i think it is going to be the most dificult one for me (i am just starting to learn python)