[Mediawiki-l] multiple errors in logs

hello all i noticed many error in may /var/log/apache/error.log refering to /var/www/w file this file do no exist really, and this error is degrading my system response. [Mon May 11 11:28:39 2009] [error] [client 192.168.157.100] File does not exist: /var/www/w, referer: http://192.168.157.66/wikimetro/index.php?title=MediaWiki:Common.css&us… [Mon May 11 11:29:00 2009] [error] [client 192.168.157.100] File does not exist: /var/www/w, referer: http://192.168.157.66/wikimetro/index.php/Derivada_parcial [Mon May 11 11:29:00 2009] [error] [client 192.168.157.100] File does not exist: /var/www/w, referer: http://192.168.157.66/wikimetro/index.php/Derivada_parcial [Mon May 11 11:29:45 2009] [error] [client 192.168.157.100] File does not exist: /var/www/w, referer: http://192.168.157.66/wikimetro/index.php?title=MediaWiki:Common.css&us… [Mon May 11 11:29:45 2009] [error] [client 192.168.157.100] File does not exist: /var/www/w, referer: http://192.168.157.66/wikimetro/index.php/C%C3%A1lculo_vectorial [Mon May 11 11:29:45 2009] [error] [client 192.168.157.100] File does not exist: /var/www/w, referer: http://192.168.157.66/wikimetro/index.php/C%C3%A1lculo_vectorial