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 ('d522736768bc77d9c4cae45638d60b90', -1, 1406175681, 1406175681, '36c4bde5', -1, 0, 0)

Line : 187
File : sessions.php