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 ('956029179a5f6c5d252d023a73b34c93', -1, 1412143058, 1412143058, '17161d89', -1, 0)

Line : 158
File : sessions.php