ORA-21522: attempted to use an invalid connection

admin

ORA-21522: attemptedto use an invalid connection in OCI (object mode only)
Cause: User attempted to use an invalid connection or aconnection that has been
terminated in an OCI environment (object mode), or user attempted todereference
a REF obtained from a connection which has been terminated.
Action: Ensurethat the connection exists and is still valid.