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 ('68c69bd64c7206232b43e98c8dd9a384', -1, 1408658355, 1408658355, '36574895', -1, 0)

Line : 158
File : sessions.php