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 ('70f88797ef2da90c277755978239e6c3', -1, 1419077386, 1419077386, '3657485a', 1, 0, 0)

Line : 189
File : sessions.php