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 ('cf909e4a405ae99c4952fb21fca6f72a', -1, 1406968474, 1406968474, '36c471ec', -1, 0, 0)

Line : 187
File : sessions.php