Can't create Curtain Wall Mullion. The portion of the curtain grid it was placed on no longer exists.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.4.0.0 (26.4.0.0)
Syntax
C#
public static FailureDefinitionId CannotCreateMullionReferenceNoGeometry { get; }