Using Revit Surface as Dynamo Surface

image3I’m new to Dynamo and forum so please guide me. I’v created a 3D Form in a Conceptual Mass family, which is instantiated in a Revit Project. In Dynamo I have that object linked with nodes “Select Model Element” --> “Element.Geometry” --> “Surface.PointAtParameter”. This actually works properly but the last node is yellow and has an error flag that says “Warning: Asked to convert non-convertable types Internal error, please report: Dereferencing a non-pointer.(3147aacd) …” (Similar behavior with Surface.NormalAtParameter, Surface.GetIsoline, etc.) Is there a way to get rid of this error? Who is it asking me to report to? (and sorry about the format of this!)


the following image shows how it worked in my file (after you´ve selected the model element, dynamo needs to know which kind of element to be used).Unbenannt