I am getting a similar error on the tools on surface plug in. I uninstalled all plugins and started fresh with the latest libfredo and tools on surface plug in so that no others would interfere. Still the same error. Other plugins from fredo 6 are working correctly.

using 2022. the error messages are attached.

Thanks.

Love the tools on surface tool, used it for years but have been getting this error in the attached image when sketch up opens. the menus do not show up the next time sketchup loads.