Exception Type: Out Of Bounds Exception

1: Function App.LookupIDSynonyms( PlanObservation ) as string()
2: Function ObservationDatabase.GetGUID( PlanObservation ) as int32
3: Function ObservationDatabase.FixupSynonyms( boolean ) as boolean

User description of above error trace:

Selected "Reset Cross-References" in the Observation Settings and let the application run throughout the night. In the morning I found this Exception.

Fixed.