I face this error many times with my replication
Last_SQL_Error: Could not execute Delete_rows event on table db_name.event; Can't find record in 'event', Error_code: 1032; handler error HA_ERR_KEY_NOT_FOUND; the event's master log mysql-bin.000131, end_log_pos 2869333
and I solved it by backup the database and restore it back to the another server then Restart the replication by CHANGE MASTER TO MASTER_LOG_FILE and MASTER_LOG_POS.
But I need to know the reason of that! why it happened?