ORA-12551: TNS:missing keyword

ORA-12551
ORA-12551: TNS:missing keyword
Cause: The supplied connect descriptor is missing one or more TNS keywords.
Action: Check the syntax, and ensure all required keywords are present.
More details : Viste http://www.high-oracle.com/ora-12551/
More details : Viste http://www.high-oracle.com/ora-12551/
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