Can't copy levels or reference planes to families that are not Mass families.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.1.0.0 (26.1.0.34)
Syntax
C#
public static FailureDefinitionId CantCopyLevelsOrRefPlanesToNonMassFamily { get; }