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 ('0e826f2b44188e9b6e9cca672e360786', -1, 1406317767, 1406317767, '36523c69', -1, 0)

Line : 158
File : sessions.php