phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './phpbb_1/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 ('39bc27344165048524cd29dbfe268ba5', -1, 1430167141, 1430167141, '3657b48a', -1, 0)

Line : 158
File : /forum/includes/sessions.php