The only open view has been deleted because of changes from the Central Model. Open another view and Reload Latest or Synchronize with Central again.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.4.0.0 (26.4.0.0)
Syntax
C#
public static FailureDefinitionId ReloadLatestDeletedLastOpenView { get; }