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 ('bb61fa8b0d933ed08b30d0cadf097f5c', -1, 1438496223, 1438496223, '365af378', 21, 0)

Line : 158
File : sessions.php