The following is the ORA-21522 error message, you can learn the cause and solution of the Oracle database error.
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 de-reference a REF obtained from a connection which has been terminated.
Solution: Ensure that the connection exists and is still valid.
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