After installing 2025.3, was Rhino.Inside.Revit installed again?
RIR must be installed after all Revit versions are installed.
This looks like a plugin conflict.
This could be a Rhino/GH conflict or a Revit Addin. In 2025.3 they have a Addin Mananger available, or you can use this one.
To troubleshoot Rhino plugins you can disable via File>Properties>Plugins and sort by Plugins that do not ship with Rhino.
To troubleshoot Grasshopper plugins you can start grasshopper via the command line with GrasshopperLoadOneByOne
Having up-to-date plugins is critical as well, you may be able to resolve it with updates.
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disabled all the add-ins and then enabled them one by one until I identified that the Climate Studio add-in was responsible for this error.
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