phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './phpbb/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 ('76579c49eee005a4e4683aa07fabb05b', -1, 1430838950, 1430838950, '369f86ef', 2, 0, 0)

Line : 189
File : sessions.php