Same issue here - Datasmith for Revit 4.25.3 and I get the error:
Cannot export the 3D view: Can not get face for the specified Wall object at Autodesk.Revit.DB.CustomExporter.Export(View view) at DatasmithRevitExporter.DatasmithRevitCommand.Execute(ExternalCommandData InCommandData, String& OutCommandMessage, ElementSet OutElements)
Same as every time I try and export a project recently. Yes the file has phasing, but this is an important part of the workflow in my office and can’t be deleted.