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 ('8f9259a1656efaf4161e4d36976a2165', -1, 1406674328, 1406674328, '36c56c7c', -1, 0)

Line : 158
File : sessions.php