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You may encounter this warning when the workset you are editing is no longer valid due to changes in the central model.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 Revit Cloud Worksharing (Alternate Method)
When you transition from an older release of Revit Cloud Worksharing to a newer release of Revit Cloud Worksharing, you must upgrade the project and its Revit models. In the following workflow, you upgrade the models individually in the Revit Cloud Worksharing project.