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--- wiki:sns:intactgh:troubleshooting [2023/12/14 16:04] – eli
+++ wiki:sns:intactgh:troubleshooting [2025/03/14 14:01] (current) – paul
@@ Line 1: / Line 1: @@
 =====Troubleshooting Guide=====
+==== Installation Troubleshooting ====
+After installation, when you start Rhino 8 and issue the “Grasshopper” command, Grasshopper starts but Intact.Simulation is not visible in the toolbar menu. In the Rhino command output, there is the following error:
+<code>
+An error occured during GHA assembly loading:
+ Path: %APPDATA%\Roaming\Grasshopper\Libraries\Intact.Simulation\IntactGrasshopper_Plugin.gha
+ Exception System.IO.FileNotFoundException:
+  Message: Could not load file or assembly 'System.Runtime, Version=7.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.
+</code>
+This error message indicates that Intact.Simulation for Grasshopper cannot be loaded. This issue occurs because Rhino 8 can be started in one of two modes: one that is compatible with older plugins using the .NET Framework 4.8, and one that is compatible with newer plugins using .NET Core 7, which is what Intact.Simulation for Grasshopper uses.
+Following [[https://developer.rhino3d.com/guides/rhinocommon/moving-to-dotnet-7/#choosing-the-net-runtime-on-windows|Rhino’s official documentation]], we recommend creating a shortcut to start Rhino 8 using .NET Core 7. Create the shortcut by navigating to the Rhino installation location (usually C:\Program Files\Rhino 8\System\Rhino.exe), right-click on it, create a shortcut, then right-click on the shortcut to edit it to start Rhino 8 as
+<code>
+"C:\Program Files\Rhino 8\System\Rhino.exe" /netcore
+</code>
+This will start Rhino 8 in a mode that is compatible with Intact.Simulation for Grasshopper. You may also want to create a similar shortcut to start Rhino 8 in a mode compatible with older plugins.
+==== Simulation Troubleshooting ====
 {{:wiki:sns:intactgh:troubleshooting_guide.jpg| }}