phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 144 Table './nadejda_lightplanet/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 ('f7e07ad155acddbe9034d2132d13ea27', -1, 1480926493, 1480926493, '36a1d8f2', -4, 0, 0)

Line : 187
File : sessions.php