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 ('9cac991e5c1f4cdc1411f4afa2203d6e', -1, 1406557249, 1406557249, '36c5935a', -1, 0, 0)

Line : 187
File : sessions.php