Error: TestFit integrations error

When importing a TestFit file into Revit using the plugin, you get an "Method not found: 'Autodesk.Revit.DB.Floor..." error.


revit 2021


This issue mainly shows up in Revit 2021.


This is a known issue, and the resolution at this time is to use Revit 2022 or 2023 if you want to import TestFit data into Revit.