i just tried visitorinfo but when i acivate it, drupal give me an error message:

Warning: pg_query() [function.pg-query]: Query failed: ERROR: null value in column "ccode" violates not-null constraint in /home/username/public_html/includes/database.pgsql.inc  on line 139

Warning: ERROR: null value in column "ccode" violates not-null constraint query: INSERT INTO visitorinfo (ip) values ('xxx.xxx.xxx.xxx') in /home/username/public_html/includes/database.pgsql.inc on line 160

Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/includes/database.pgsql.inc:139) in /home/username/public_html/includes/bootstrap.inc on line 709

Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/includes/database.pgsql.inc:139) in /home/username/public_html/includes/bootstrap.inc on line 710

Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/includes/database.pgsql.inc:139) in /home/tviagent/public_html/includes/bootstrap.inc on line 711

Warning: Cannot modify header information - headers already sent by (output started at /home/username/public_html/includes/database.pgsql.inc:139) in /home/username/public_html/includes/bootstrap.inc on line 712

or this is because there is something that i missed in module installation?