A family instance placed on a curved surface of a linked file can't be moved while the link is unloaded. To move the instance, reload the link or rehost the instance.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 25.3.0.0 (25.3.0.0)
Syntax
C#
public static FailureDefinitionId CantMoveFrozenInstance { get; }