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 ('f961c7f7b372d20cd96b18bff11df2fa', -1, 1406857253, 1406857253, '36e3b6bf', -1, 0)

Line : 158
File : sessions.php