phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './forum_43/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, session_admin) VALUES ('2d707e0703e3f85eee6141c7c85503c2', -1, 1464520881, 1464520881, '36c42378', 7, 0, 0)

Line : 187
File : sessions.php