Y had the same problem, you did not complete the sql query. This is the part you didnt insert:
INSERT INTO `configuration` ( `configuration_id` , `configuration_title` , `configuration_key` , `configuration_value` , `configuration_description` , `configuration_group_id` , `sort_order` , `last_modified` , `date_added` , `use_function` , `set_function` )
VALUES (
'', 'Bulk Mailer Limit', 'BULKMAILER_LIMIT', '5', 'Defines how many e-mails will be sent at a time', '3', '20', NULL , NOW( ) , NULL , NULL
);
INSERT INTO `configuration` ( `configuration_id` , `configuration_title` , `configuration_key` , `configuration_value` , `configuration_description` , `configuration_group_id` , `sort_order` , `last_modified` , `date_added` , `use_function` , `set_function` )
VALUES (
'', 'Bulk Mailer Interval [seconds]', 'BULKMAILER_INTERVAL', '12', 'Defines time between each bulk e-mails send', '3', '20', NULL , NOW( ) , NULL , NULL
);