Oracle : Ошибка ORA-22919

"dangling REF error or lock object failed for no wait request"
*Cause: The error could be one of the following. The object corresponding
to the REF does not exist or the object was locked
by another user and the lock with nowait request failed.
*Action: Ensure that the REF value is pointing to an existing object or
issue a lock request without the nowait option.

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