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 ('befc1c67f5cac4dccd1d648a6be425fb', -1, 1408771896, 1408771896, '36c6039a', -1, 0)

Line : 158
File : sessions.php