Rhino Compute - Python 3.9.10 is not yet ready or failed initialization

Rhino Developer compute.rhino3d
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25

Hi @eirannejad

Since last update we are having the same problem. Even after deleting the folder and running rhinoscript. The error message is the same as shown in @Foxman log file.

  1. Language Python 3.9.10 (mcneel.pythonnet.python) is not yet ready or failed initialization

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Error 08/21/2025 13:26:12 [RhinoCode] Error Initializing Python | Error loading CPython engine | System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
—> Python.Runtime.InternalPythonnetException: Failed to create Python type for BVHOffsetCalculator

System.IO.FileNotFoundException: Could not load file or assembly ‘VVVV.Utils, Version=1.0.4375.26574, Culture=neutral, PublicKeyToken=null’. Het systeem kan het opgegeven bestand niet vinden.
File name: ‘VVVV.Utils, Version=1.0.4375.26574, Culture=neutral, PublicKeyToken=null’
at System.Signature.GetSignature(Void* pCorSig, Int32 cCorSig, RuntimeFieldHandleInternal fieldHandle, IRuntimeMethodInfo methodHandle, RuntimeType declaringType)

26

after reinstalling Rhino the problem still remains

27

Hi @Foxman and @eirannejad,

I solved the problem after deinstalling Wizard. Wizard | Food4Rhino

The strange thing is that I had installed this plug-inn a long time ago, without having any problems so far.

28

@eirannejad

I had this issue today and was able to resolve the issue by disabling my firewall. The installer was not able to access a URL needed for the install.

Maybe this could be a fix for others if it comes up again.

29

I encountered the same issue. The reason was that I had separately installed Python 3.13 and added its path to the “Environment Variables”. After removing the Python 3.13 path from the environment variables and then launching Rhino 8 again to run the ScriptEditorcommand, everything worked normally.

30

Hi There,

I have got such an issue with the installed version 8 SR32 (8.32.26131, 18001, 2026/05-11).

Trying to fix the issue, by deleting .rhinocode and re-initialize, did not help.

Attached are the outcomes of “scripteditor” and “rhinocodelogs”.

I would appreciate your support.

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logs.txt (9.5 KB)

31

I am getting the following error in the py3 component when using Rhino inside: Language Python 3.9.10 (mcneel.pythonnet.python) is not yet ready or failed initialization

Deleting the rhinocode folder is not working. Re-installing Rhino and Rhino Inside also not doing the trick. Running Rhino.inside 1.37. Script editor commands are greyed out when using Rhino Inside. Resetting Python 3 from ScriptEditor in standalone Rhino does nothing.

The persistence of this issue will soon force me to remove Rhino entirely from my Revit workflow. Thank you for any help-

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rhinocodelog.txt (10.1 KB)

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Update: this resolved itself by installing RhinoInside.Revit_1.36.9698.18734. I had leapfrogged from 1.35 to 1.37 and apparetnly that was the issue.