It appears that you have an older version of the user_tracking table and a newer version of the user tracking code installed. Please download the user tracking contrib again and execute the SQL for creating the user_tracking table which looks like:

Code:
DROP TABLE IF EXISTS user_tracking;
CREATE TABLE user_tracking (
  `customer_id` int(11) default NULL,
  `click_id` int(11) default NULL,
  `full_name` varchar(64) NOT NULL default '',
  `session_id` varchar(32) NOT NULL default '',
  `ip_address` varchar(15) NOT NULL default '',
  `time_entry` varchar(14) NOT NULL default '',
  `time_last_click` varchar(14) NOT NULL default '',
  `last_page_url` varchar(128) NOT NULL default '',
  `referer_url` varchar(254) NOT NULL default '',
  `page_desc` varchar(64) NOT NULL default '',
  `customers_host_address` varchar(64) NOT NULL default ''
) TYPE=MyISAM;
This should correct the problem. Let us know if not?

Good Luck!
Jeff