Can't login to Media Browser

Hi all,

I made changes to my site-config in Apache2 because it was necessary for another web-app that runs on my server. After that change, I'm not able to login to the Media Browser.
The logging shows this error:

  Code:

[ServiioStatusService] AuthenticationException occured. Returning error code 401 to the REST layer. Message: null

This is my 'default' site config in Apache2

  Code:

ServerAdmin webmaster@localhost

DocumentRoot /var/www
   <Directory />
      Options FollowSymLinks
      AllowOverride All
   </Directory>
   <Directory /var/www/>
      Options Indexes FollowSymLinks MultiViews
      AllowOverride All
      Order deny,allow
      allow from all
      Satisfy all
   </Directory>

   ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
   <Directory "/usr/lib/cgi-bin">
      AllowOverride None
      Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
      Order allow,deny
      Allow from all
   </Directory>

   ErrorLog ${APACHE_LOG_DIR}/error.log

   # Possible values include: debug, info, notice, warn, error, crit,
   # alert, emerg.
   LogLevel warn

   CustomLog ${APACHE_LOG_DIR}/access.log combined

Can you help me please?