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 ('ef68445c946bc99a6e34a2f6769591ee', -1, 1422210367, 1422210367, '36a62004', 15, 0, 0)

Line : 187
File : sessions.php