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MySQL error code

MySQL error 3991

MySQL server error 3991 is ER_RPL_ASYNC_RECONNECT_AUTO_POSITION_OFF, reported with SQLSTATE HY000.

Failed to enable Asynchronous Replication Connection Failover feature. The CHANGE REPLICATION SOURCE TO SOURCE_CONNECTION_AUTO_FAILOVER = 1 can only be set when SOURCE_AUTO_POSITION option of CHANGE REPLICATION SOURCE TO is enabled.
Error3991
NameER_RPL_ASYNC_RECONNECT_AUTO_POSITION_OFF
SQLSTATEHY000
GroupServer errors

Source: MySQL 8.4 Error Reference