Apache UrlRouting错误

I use apache 2.4 on lmde2 (Linux-Mint-Debian2).

If i try to load a script located like this: "/var/www/html/site1/sites/weiteres.php"

Apache generate a link like this: "http://localhost/site1//var/www/html/site1/sites/weiteres.php". Maybe the error happens here: //

This would be right: "http://localhost/site1/sites/weiteres.php".

My apache2.conf at "/etc/apache2/apache2.conf" has this active:

    <Directory /var/www/>
Options Indexes FollowSymLinks
AllowOverride None
Require all granted

But the root directory is "/var/www/html/ it looks like there must be another configuration file.