[otrs] OTRS 2.0.1 Calendar Error

Hello, I am using OTRS 2.0.1. The ff error is repeatedly appearing on "System Log": Table 'otrs.calendar_event' doesn't exist, SQL: 'SELECT id FROM calendar_event WHERE (start_time >= '2005-08-18 19:49:19' AND end_time <= '2005-08-25 23:59:59') OR (start_time >= '2005-08-18 19:49:19' AND start_time <= '2005-08-25 23:59:59') OR (end_time >= '2005-08-18 19:49:19' AND end_time <= '2005-08-25 23:59:59') OR (start_time <= '2005-08-18 19:49:19' AND end_time >= '2005-08-25 23:59:59') ORDER BY start_time' I believe this is related to database, am I correct? I do not have any idea how to solve this, hoping help from you. (= Len