phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 145 Table './mw_phpbb/phpbb_mw_sessions' is marked as crashed and should be repaired

INSERT INTO phpbb_mw_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('21f29eb79903d558a6a54da8783a35bd', -1, 1368866078, 1368866078, 'b848b868', 26, 0, 0)

Line : 187
File : sessions.php