I'm guessing that support_ostt1 is the name of your database.
It's telling you that the ost_group_dept_access table doesn't exist in that database. It sounds like something in the upgrader isn't working correctly. You can create the table manually or run the following MySQL query:
CREATE TABLE `ost_group_dept_access` (
`group_id` int(10) unsigned NOT NULL default '0',
`dept_id` int(10) unsigned NOT NULL default '0',
UNIQUE KEY `group_dept` (`group_id`,`dept_id`),
KEY `dept_id` (`dept_id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;
INSERT INTO `ost_group_dept_access` (`group_id`, `dept_id`) VALUES
(1, 1), (1, 2), (2, 1), (2, 2), (3, 1), (3, 2);