A boundary on this surface could not be autodetected. Revit will impose one, but it may be larger than you want.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.1.0.0 (26.1.0.34)
Syntax
C#
public static FailureDefinitionId BoundaryDetectError { get; }