Assembly: msmgdsrv (in msmgdsrv.dll)
The collection has changed, invalidating the enumerator. For more information on this exception, see InvalidOperationException Class.
An enumerator remains valid as long as the collection remains unchanged. If changes are made to the collection, such as adding, modifying or deleting elements, the enumerator is irrecoverably invalidated, and the next call to or Reset throws an InvalidOperationException.