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 ('9a49e4331421952e42d855c9948a5857', -1, 1464208795, 1464208795, '3651e14b', -1, 0, 0)

Line : 187
File : sessions.php