ORA-21522: attempted to use an invalid connection in OCI (object mode only)

Cause : User attempted to use an invalid connection or a connection that has been terminated in an OCI environment (object mode), or user attempted to dereference a REF obtained from a connection which has been terminated.

Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts

Ensure that the connection exists and is still valid.

update : 26-09-2017
ORA-21522

ORA-21522 - attempted to use an invalid connection in OCI (object mode only)
ORA-21522 - attempted to use an invalid connection in OCI (object mode only)

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