Cannot locate Pollination Rhino plugin

[fedosde (Denis Fedosov)]

Hello!

After installation Rhino plugin the following issue appears:
“Unable to load Pollination.RH.rhp plug-in: initialization failed”

Also, when try to check my license, it doesn’t allow to use any PO commands, showing them as unknown commands

Tried to re-install Pollination and Rhino itself, nothing helped so far. Any thought how to solve the issue?
Thanks,

[fedosde (Denis Fedosov)]

[mostapha]

Hi @fedosde, Can you check the logs inside this folder, and see if there is anything that could help us understand the issue: %appdata%\Pollination\logs

I wonder if there is a conflict with one of the other Rhino plugins.

@mingbo, how would you suggest debugging this issue?

[raunakt (Raunak Tibrewala)]

Hello @mostapha
Snapshot of the recent log file. Unsure if it explains anything.

[mostapha]

Hi @raunakt,

Thank you for sharing the logs. You’re several versions behind. Is it possible to update Rhino and the Pollination Rhino plugin? Here is what I see on my end.

[raunakt (Raunak Tibrewala)]

Hi @mostapha
We tried installing the latest version of pollination i.e. 1.65.10 but its not working. And for some reason in the logs still show 1.54. Any recommendation to do a clean uninstallation.

[mostapha]

@raunakt

And for some reason in the logs still show 1.54. Any recommendation to do a clean uninstallation.

That’s helpful. Yes. This is telling me that the wrong DLLs are being loaded from another installation.

Can you try the PluginManager command and see where the DLL is loaded from. You might need to uninstall or delete an older version of the plugin manually.

1. Run the PluginManager command.
2. Search for Pollination.
3. Select Pollination.RH and click on details.
4. Check the File Name. It should be C:\Program Files\pollination\plugin\8.0\Pollination\Pollination.RH.rhp

Also, if you have multiple versions of Rhino, you might need to ensure to only install it for Rhino 8 to help Rhino 8 find the correct DLLs. See here:

Pollination Rhino is now fully compatible with Rhino 8

Hello everyone! We have been supporting Rhino 8 for a few months but have been hesitant to make it official until now mainly because Pollination was not compatible with .NET Core. But not anymore! We are glad to announce that the latest version of the Pollination Rhino plugin (v1.52.12) now supports Rhino 8 and is compatible with .NET Core. [Rhino 8 and .NETCore] You can download the latest version of the installer from the download page. Important Notes Minimum Rhino 8 service release req…

[raunakt (Raunak Tibrewala)]

Hi @mostapha ,

When I search for Pollination in Plugin Manager, I cannot find Pollination.RH but can see others.

[raunakt (Raunak Tibrewala)]

I do have Rhino 7 and Rhino 8 on my system. I am getting the same error on both versions. Also, tried installing just for Rhino 8 and still same issue.

[mostapha]

Can you check the file path for one of the other dlls? Say Pollination.RH.Core.

[raunakt (Raunak Tibrewala)]

All other dlls are loaded from - C:\Program Files\pollination\plugin\8.0\Pollination
Pollination.RH.Loader loaded from - C:\ProgramData\McNeel\Rhinoceros\packages\8.0\Pollination\1.65.10\net48

[mingbo]

Hi @raunakt, Can you check if this file exists?
C:\Program Files\pollination\plugin\8.0\Pollination\Pollination.RH.rhp
If yes, can you try to manually drag and drop the RHP file onto Rhino canvas?

[raunakt (Raunak Tibrewala)]

Hi @mingbo , Yes,
the file is there in the folder. But when I drag and drop to rhino, it gives same error message that unable to load-initialization failed.

[mingbo]

Hi @raunakt, thanks for the update.
That’s really weird, and I can see the Environmental_Analysis.rhp is loaded without an issue.
What version of Rhino 8 are you using? Would you mind updating it to the latest version of Rhino 8?
Before updating Rhino 8, can you try to use command SetDotNetRuntime to get what version of dotnet runtime you are using with Rhino 8?

[raunakt (Raunak Tibrewala)]

Hi @mingbo, I uninstalled all previous versions of Rhino and performed a clean installation of Rhino 8. After that, I installed the Pollination plugin, which worked fine for a day. However, it has started throwing the same error again, and I’m unable to understand what might be causing the issue.
Rhino version - Version 8 SR17 (8.17.25066.7001, 2025-03-07)
Dotnet version - .NET Framework 4.8.9310.0

[mingbo]

Hi @raunakt did you manually set NET Framework 4.8.9310.0 for Rhino 8 on purpose? Rhino uses .Net 8 by default.

@raunakt

I installed the Pollination plugin, which worked fine for a day. However, it has started throwing the same error again, and I’m unable to understand what might be causing the issue.

This is really weird, were you able to investigate what was the difference between the day it works and a day after it failed to load?
Did you also install any other plugins that might have conflicts with the Pollination plugin?