When creating an opening, you cannot sketch loops within other loops. The highlighted loop(s) are contained within another loop.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.2.0.0 (26.2.0.0)
Syntax
C#
public static FailureDefinitionId ContainedInOtherLoops { get; }