Oracle : Ошибка ORA-12209

"TNS:encountered uninitialized global"
*Cause: Application calling navigation routine has not properly configured
the global variables. There are no TNSNAV.ORA files available, or they
are defective.
*Action: Not normally visible to the user. For further details, turn
on tracing and reexecute the operation. If error persists, contact
Worldwide Customer Support.

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