phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './cw_portal/phpbb_sessions' is marked as crashed and last (automatic?) repair failed

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin, SearchBot) VALUES ('57580b95bf108d853f5a830ce5190bd2', -1, 1406630490, 1406630490, '36cc7fbf', 0, 0, 0, 'CCBot/2.0 (http://commoncrawl.org/faq/)')

Line : 187
File : sessions.php