ORA-38408: The ADT "string" does not exist in the current schema.

ORA-38408
ORA-38408: The ADT "string" does not exist in the current schema.
Cause: An attempt was made to create the attribute set from a nonexistent ADT.
Action: Make sure that the ADT with the same name as the attribute set exists in
the current schema.
More details : Viste http://www.high-oracle/ora-38408/
More details : Viste http://www.high-oracle/ora-38408/
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Your source for help on all Oracle database error codes :
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Error Oracle : ora-31518 http://www.high-oracle.com/ora-31518/
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