Civilconnection error : Unable to create polygon : API_FAILED -- operation unsuccessful

hi. i tried to getting my c3d surface into revit, but i get this error message

anyone know what it is?

i’m using revit 2022 and c3d 2022.

Hi @aditioarch
When I use the node CivilSurface.GetTrianglesSurface - Dynamo doesnt work.
i’m using revit 2025 and c3d 2025.
Try to use node GetTrianglesSurfaces with LandXML input.

hi damdinsuren,

i did getriangles.surface with landxml input, but it shows error :

Warning: CivilSurface.GetTrianglesSurfaces operation failed.
Error creating Surface: Points are coincident

any ideas how to fix this?

Herhaps input error:

Coincident lines are the lines that are on top of each other . They are neither parallel lines nor perpendicular lines but are completely similar.

Can you upload your dwg file?