MySQL error when installing TaskList

Issue Summary

user warning: Unknown column 'parent' in 'field list' query: INSERT INTO tasks_advanced (nid, taskcategory, tasktype) SELECT t.nid, 'unknown', IF(t.nid IN (SELECT parent FROM tasks), 'project', 'action') FROM tasks t LEFT JOIN tasks_advanced a ON t.nid = a.nid WHERE ISNULL(a.nid) in /home/.sites/78/site85/web/drupal/includes/database.mysql.inc on line 172.

user warning: Unknown column 'parent' in 'where clause' query: UPDATE tasks_advanced SET tasktype = 'project' WHERE nid = (SELECT nid FROM tasks WHERE parent = 0) in /home/.sites/78/site85/web/drupal/includes/database.mysql.inc on line 172.

user warning: Unknown column 'parent' in 'where clause' query: SELECT nid parent FROM tasks WHERE parent = 0 in
/home/.sites/78/site85/web/drupal/includes/database.mysql.inc on line 172.

Also receive similar error using 'HEAD' version.
Drupal version is 5.1
Tasklist version is 5.x-1.2