phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './forum/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) VALUES ('7cd0a16b7c4a78451a9fecdb72fb0aef', -1, 1410996952, 1410996952, '36c54a82', -1, 0, 0)

Line : 187
File : sessions.php