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 ('4d7f633a6ed3e34047f597fc81edb30b', -1, 1464308083, 1464308083, '3651e19d', -1, 0, 0)

Line : 187
File : sessions.php