Hello all, I recently installed the Pollination Grasshopper plugin for the first time to use Ironbug. I get the following error when opening Grasshopper: Priority: CategoryIcon { Could not load file or assembly 'System.ComponentModel.Annotations, Version=4.2.0.0, Culture=neutral, PulicKeyToken=…

Here is an update: [image] Problem with loading Pollination for Grasshopper Version 1.26.7 Grasshopper Plugin Just to update everyone here that we have identified the source of the issue in the GH plugin that failed to load. We have a new dev version of the installer here…

Hi @loganmacb , Is it possible that you have an antivirus that blocks or removes the Pollination.GH.gha file after the installation. Can you see the file in the path that is indicated above? Path: C:\Program Files\pollination\plugin\7.0\Pollination-GH\Pollination.GH.gha Also, can you try using the…

@mostapha Thank you for the quick reply. I verified the Pollination.GH.gha file is in its correct location and is not blocked. After digging into the error a bit more I believe there’s a bit of a bug here where this “Pollination.GH.gha” file is referencing “System.ComponentModel.Annotations.dll” o…

Hi @loganmacb thanks for your detailed debugging information. What version of the Rhino 7 are you using? Are you using the latest sub-version of Rhino 7?

Same Issue here Priority: CategoryIcon { Could not load file or assembly ‘System.ComponentModel.Annotations, Version=4.2.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a’ or one of its dependencies. The system cannot find the file specified. FileNotFoundException } Installed Pollination v…

Following @Mostapha recommendation I uninstalled pollination and reinstalled the same version but from the rhino plugin download and now it works. It seems there is something off with the other installer.

Installation Error: FileNotFoundException

Grasshopper Plugin

mingbo (Mingbo) November 7, 2025, 9:07pm 8

Here is an update: