Case Tracker and Phpfreechat

After installing both modules, it gives the following error when I try to edit content type 'casetracker_basic_case':

Warning: Table 'watchdog' was not locked with LOCK TABLES query: INSERT INTO watchdog (uid, type, message, severity, link, location, referer, hostname, timestamp) VALUES (1, 'php', 'Duplicate entry 'phpfreechat_nodeapi_custom_casetracker_basic_cas' for key 1\nquery: INSERT INTO variable (name, value) VALUES ('phpfreechat_nodeapi_custom_casetracker_basic_case', 'i:0;') in /home/mysite/public_html/includes/database.mysql.inc on line 155.', 2, '', 'http://www.mysite.us/admin/content/types/casetracker-basic-case', 'http://www.mysite.us/admin/content/types/casetracker-basic-case', '24.6.000.249', 1187984356) in /home/mysite/public_html/includes/database.mysql.inc on line 155