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 ('75ed0ff26f28bb8e9546974cb97620ec', -1, 1430053216, 1430053216, '36c5c7bf', 1, 0)

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