Could not load file or assembly 'Python.Runtime' error

mahagh · September 10, 2025, 8:26pm

It’s been a while that I have not work with the project. I just started working with it and got another error that I am not sure if it is about the Pollination or not.

Below is the screenshot of the error when I want to save the OSM format and appreciate your help here to make sure about the source of issue.

It does not matter what is the geometry, I tried it with couple of geometries and got the same error.

Thanks in advance for your help.
MaHa

mostapha · September 10, 2025, 9:14pm

Hi @mahagh,

@mingbo is the right person to help with this error. I’m not able to recreate this issue but maybe because I’m not testing it with the right model.

Also, let’s see if installing the latest version of the Rhino plugin resolves this issue. Here is the installer:

mahagh · September 10, 2025, 11:14pm

Thank you @mostapha, I tried the update but did not solve the issue.

mingbo · September 11, 2025, 4:21pm

Hi @mahagh, my best guess of the source of the issue is there is another plugin you installed that uses another version of Python.Runtime, which creates a conflict with the Pollination plugin.

What version of Rhino 8 do you have installed? You can use SystemInfo in Rhino command to get the full details.

Please zip this log folder and share it with us for debugging.
%appdata%/pollination/logs

mahagh · September 11, 2025, 4:43pm

Thank you @mingbo,
My Rhino version is Rhino 8 SR23 2025-9-8
I shared it with you in message.

Thanks,
MaHa

mingbo · September 11, 2025, 5:04pm

Hi @mahagh do you have any other plugins installed?

mahagh · September 11, 2025, 5:07pm

On one of the systems yes (Forma), but not on the other one.
Hope it helps

mingbo · September 11, 2025, 6:47pm

Just to update everyone, BHoM is also using the Python.Runtime, and it is using a different version which causes the conflicts. After disabling BHoM plugins, everything works again.