I stumbled upon this error when i tried importing a 3dm file into Revit after RiR add-in is installed.
To replicate this behaviour. Import attached 3dm (or any 3dm file). It will work.
Install/enable RiR addin. Import attached 3dm (or any 3dm file). Error occurs.
See screenshots for details.
I am assuming Rhino Inside Revit plugin seems to cause an issue/conflict with the built-in “Import CAD” command in Revit.
Sample 3dm file:
box.3dm (37.4 KB)