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 ('cb3e8895c78f79b0860d4d0ee4ec5177', -1, 1464230448, 1464230448, '36514848', -1, 0, 0)

Line : 187
File : sessions.php