Hello,
I attempted to connect to the Civil 3D drawing, but I received this message.
which dynamo pack., civil3d , and revit did you use?
To connect c3d from revit you use c3d com api for that make sure you open c3d file at the same time you run dynamo and use the compatible ver. of c3d abd revit
In the case you need explore the eco proces for software Revit,Civil,Cad
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I use 2022 for Revit and Civil3D.