phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './forum_members/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) VALUES ('f8f0fb769e39b298d14dde057d6ee46d', -1, 1398273798, 1398273798, '3211ae5e', -9, 0)

Line : 158
File : sessions.php