Can't copy between Mass or Curtain Panel by Pattern families, and other families or Revit projects.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.3.0.0 (25.3.0.0)
Syntax
C#
public static FailureDefinitionId CannotCopyByPatternFamilies { get; }