RIR Grasshopper Error

Rhino.Inside Revit
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1

Hi

I cannot load Grasshopper in Revit…

I can open Rhino from Revit but not GH…(I tried to uninstall and Install again RIR…but nothing changed…I currently use Rhino8 and Revit2025… I’m also a Tekla user…and Tekla 2025 works ok)

I got this error…

An error occured during GHA assembly loading:
Path: C:\ProgramData\Autodesk\Revit\Addins\2025\RhinoInside.Revit\R8\RhinoInside.Revit.GH.gha
Exception System.MissingMethodException:
Message: Method not found: ‘System.Drawing.Bitmap Grasshopper.Kernel.IGH_ObjectProxy.get_Icon()’.

2

Hi Ric,

What exact Rhino 8 version & Revit are you running?

This sounds like a plugin conflict. Revit 2025.3 and above ships with a plugin manager for trouble shooting.

If you are on the latest of everything, try uninstall RiR and reinstall.