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 ('a4c87fddc763df2c9dcba0a167be21ba', -1, 1397827700, 1397827700, '6b16258f', -1, 0)

Line : 158
File : sessions.php