Rhino.Inside Revit failed - openNURBS Conflict

Hi there,

I am having trouble with opening Rhino WIP/Grasshopper in a specific Revit file.
The error messages says “An unsopported openNURBS version is laready loaded. Rhino.Inside cannot run”. But I didn’r load any openNURBS to this file…
And strangely if I open Autodesk "Revit Basic Sample Projec"t first and this revit file followingly, I could use Rhino WIP/Grasshopper in this Revit file.
Does anyone know how to solve this?
Thank you,


There is a plug-in or the Revit rhino 3dm importer has run that is loading the older rhino3dm library.

Perhaps these steps will help you find the conflict: https://www.rhino3d.com/inside/revit/beta/reference/toubleshooting