Oracle : Ошибка ORA-00980

"synonym translation is no longer valid"
*Cause: A synonym did not translate to a legal target object. This
could happen for one of the following reasons:
1. The target schema does not exist.
2. The target object does not exist.
3. The synonym specifies an incorrect database link.
4. The synonym is not versioned but specifies a versioned
target object.
*Action: Change the synonym definition so that the synonym points at
a legal target object.

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