The following is the ORA-24406 error message, you can learn the cause and solution of the Oracle database error.
ORA-24406 API mode switch is disallowed when a call is in progress.
Cause: A mode switch from OCI8 to OCI7 was attempted in a callback.
Solution: The user should perform the API mode switch either prior to initiating the top call or after the main call has completed.
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