Local File is Not Compatible
You may encounter this warning when the workset you are editing is no longer valid due to changes in the central model.
Upgrade Information for Collaboration for Revit (Alternate Method)
When you transition from an older release of Collaboration for Revit to a newer release of Collaboration for Revit, you must upgrade the project and its Revit models. In the following workflow, you upgrade the models individually in the Collaboration for Revit project.