[Mediawiki-l] multiple errors in logs

[Enrique]

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&usemsgcache=yes&ctype=text%2Fcss&smaxage=18000&action=raw&maxage=18000

[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&usemsgcache=yes&ctype=text%2Fcss&smaxage=18000&action=raw&maxage=18000

[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