Open stringer can't be created for selected nosing profile. Set nosing profile to default to get open stringers created.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.3.0.0 (25.3.0.0)
Syntax
C#
public static FailureDefinitionId OpenStringerConflictNosing { get; }