I can load Grasshopper 2, and on R7 and R9WIP, GH Native works and GH2. - Its just R8.
I dont know what happened , I just opened a workfile and it stopped working and gives me this error:
I’ve tried restarting, reinstalling, disabling and renabling GH, running in safe mode, switching between .netframework vs .core everything that the forums have said and even Mcneel Tech support doesn’t have an answer except to post this in the forums. Praying to the internet Gods to find a solution for this , my Rhino9WIP expires in 10days All my work currently sits on the WIP.
May the GH Lord D Rutten have mercy on my soul and may he grant me the miracle of working GH
Error occurred loading plug-in
Details:
The type initializer for ‘Grasshopper.GUI.Canvas.GH_Canvas’ threw an exception.
Grasshopper
====
at Grasshopper.Plugin.GH_PluginUtil.LoadGrasshopper(String& message)
at GrasshopperPlugin.GrasshopperPlugin.OnLoad(String& errorMessage)
at Rhino.PlugIns.PlugIn.InternalOnLoad(Int32 pluginSerialNumber)
Thank you, I tried that, it asks for me if i want to load the plugin, i click “yes”. then it throws the same error: “Unknown command: GrasshopperLoadOneByOne”
Integrated accelerated graphics device with 4 adapter port(s)
Video pass-through to primary display device
OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
GPU Tessellation is: Off
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU’s maximum)
Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High
Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 5-29-2024
Driver Version: 32.0.15.5597
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 8 GB
I’ve been trying to troubleshoot it as well and here is a list of the steps i’ve taken:
Steps already taken — none resolved the issue:
Ran Rhino as administrator
Cleared %AppData%\Grasshopper folder entirely
Cleared %USERPROFILE%\.rhinocode folder and let it rebuild
Ran Rhino Repair via the installer
Manually registered RhinoCodePlugin.rhp via PluginManager (it was missing from loaded plugins)
Checked GPU drivers and disabled GPU tessellation
Checked and updated .NET Framework — already on 4.8
Verified no conflicting plugins via PluginManager
Discovered via RhinoCode logs that microsoft.netframework.referenceassemblies.net48 nupkg was corrupt — deleted and reinstalled via NuGet CLI successfully
Manually fixed LoadMode registry value for GH1 (was set to 0, changed to 2)
What the RhinoCode logs show:
After fixing the nupkg issue, the only remaining error in the logs is:
Error building stubs for System.Resources.Extensions, Version=10.0.0.0 |
Could not load type 'System.Resources.IResourceWriter' from assembly
'System.Resources.Writer, Version=4.0.0.0'
This Version=10.0.0.0 is a .NET 10 assembly — it’s unclear why Rhino SR28 is referencing it, as the system is running .NET Framework 4.8. This may be the underlying cause of the GH_Canvas type initializer failure, but we’re not sure.
Current state:
GH1 now attempts to load at startup (LoadMode fixed) but immediately crashes with the GH_Canvas exception
GH2 loads and works normally
ScriptEditor loads Python and IronPython successfully but shows a warning on C# 9.0 (mcneel.roslyn.csharp) — “Error Occurred During Language Initialization”
Windows Event Log shows nothing related to the crash
System.Resources.Extensions Version=10.0.0.0 stub error persists in every RhinoCode log session
Found a solution? Have the exact same. Worked the previous day, now it doesn’t. Had not installed/uninstalled anything, not run an update of some sorts
Rhino 8 SR28 2026-2-10 (Rhino 8, 8.28.26041.11001, Git hash:master @ b7874a05a6982d0419fcc4f6009b510b48a09cb3)
License type: Commercial, build 2026-02-10
License details: Cloud Zoo
Windows 11 (10.0.26200 SR0.0) or greater (Physical RAM: 64GB)
.NET Framework 4.8.9221.0
Computer platform: LAPTOP - Plugged in [99% battery remaining]
Non-hybrid graphics configuration.
Primary display and OpenGL: NVIDIA GeForce RTX 3080 Ti Laptop GPU (NVidia) Memory: 16GB, Driver date: 11-6-2024 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 566.14
> Integrated accelerated graphics device with 4 adapter port(s)
- Windows Main Display is laptop's integrated screen or built-in port
Primary OpenGL: NVIDIA GeForce RTX 3080 Ti Laptop GPU (NVidia) Memory: 16GB, Driver date: 11-6-2024 (M-D-Y). OpenGL Ver: 4.6.0 NVIDIA 566.14
> Integrated accelerated graphics device with 4 adapter port(s)
- Windows Main Display is laptop's integrated screen or built-in port
Secondary graphics devices.
Intel(R) Iris(R) Xe Graphics (Intel) Memory: 1GB, Driver date: 1-27-2022 (M-D-Y).
> Integrated graphics device with 4 adapter port(s)
- There are no monitors attached to this device. Laptop lid is probably closed
OpenGL Settings
Safe mode: Off
Use accelerated hardware modes: On
GPU Tessellation is: On
Redraw scene when viewports are exposed: On
Graphics level being used: OpenGL 4.6 (primary GPU's maximum)
Anti-alias mode: 4x
Mip Map Filtering: Linear
Anisotropic Filtering Mode: High
Vendor Name: NVIDIA Corporation
Render version: 4.6
Shading Language: 4.60 NVIDIA
Driver Date: 11-6-2024
Driver Version: 32.0.15.6614
Maximum Texture size: 32768 x 32768
Z-Buffer depth: 24 bits
Maximum Viewport size: 32768 x 32768
Total Video Memory: 16 GB
Rhino plugins that do not ship with Rhino
C:\ProgramData\McNeel\Rhinoceros\packages\8.0\LadybugTools\1.38.234\Ladybug.RH.Loader.rhp "Ladybug.RH.Loader" 1.38.234.0
C:\ProgramData\McNeel\Rhinoceros\packages\8.0\Pollination\1.52.20\Pollination.RH.Loader.rhp "Pollination.RH.Loader" 1.52.20.0
Rhino plugins that ship with Rhino
C:\Program Files\Rhino 8\Plug-ins\Commands.rhp "Commands" 8.28.26041.11001
C:\Program Files\Rhino 8\Plug-ins\rdk.rhp "Renderer Development Kit"
C:\Program Files\Rhino 8\Plug-ins\RhinoRenderCycles.rhp "Rhino Render" 8.28.26041.11001
C:\Program Files\Rhino 8\Plug-ins\rdk_etoui.rhp "RDK_EtoUI" 8.28.26041.11001
C:\Program Files\Rhino 8\Plug-ins\NamedSnapshots.rhp "Snapshots"
C:\Program Files\Rhino 8\Plug-ins\MeshCommands.rhp "MeshCommands" 8.28.26041.11001
C:\Program Files\Rhino 8\Plug-ins\IronPython\RhinoDLR_Python.rhp "IronPython" 8.28.26041.11001
C:\Program Files\Rhino 8\Plug-ins\RhinoCycles.rhp "RhinoCycles" 8.28.26041.11001
C:\Program Files\Rhino 8\Plug-ins\Toolbars\Toolbars.rhp "Toolbars" 8.28.26041.11001
C:\Program Files\Rhino 8\Plug-ins\3dxrhino.rhp "3Dconnexion 3D Mouse"
C:\Program Files\Rhino 8\Plug-ins\Displacement.rhp "Displacement"
C:\Program Files\Rhino 8\Plug-ins\SectionTools.rhp "SectionTools"
All my work currently sits on the WIP.