The elements you have selected for grouping contain dimensions or tags which do not reference a common model group.
No detail group has been created.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 26.2.0.0 (26.2.0.0)
Syntax
C#
public static FailureDefinitionId CannotCreateGroupWithInvalidReferences { get; }