3D Dynamic block creation - Invalid 2D point problem

Civil3D
1

Hi,
I am creating a 3D dynamic block in Civil 3D. I want to assign linear parameters to all the three dimensions. I have assigned it on 2 sides. But on the 3rd side, it says invalid 2D point while selecting side to attach linear parameter (See the picture below).

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Does anyone know solution to this?

2

Best to ask this in a Civil 3D forum, as this isn’t related to Dynamo. Closing accordingly, but DM me if it is related somehow.