phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './phpBB/phpbb_sessions' is marked as crashed and should be repaired

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('f884e46b61ad4c37c18d53cf52a8fc8b', -1, 1368928326, 1368928326, '36e04f5d', 0, 0, 0)

Line : 172
File : sessions.php