Message Oracle ORA-29968 - No primary operator bindings found for ancillary binding #string

ERRORNo primary operator bindings found for ancillary binding #string
CAUSEAt least one ancillary binding of the specified operator could not be validated because all of its associated primary operator bindings have been dropped.
ACTIONEither drop the ancillary binding whose primary operators are missing, or drop the entire operator, if this is the only binding. This binding cannot be re-validated.