Cacti via vhost

Ich habe cacti installiert und es funktionierte auch nur will ich das nun über Vhost machen und habe ein Problem

[Thu Jun 09 13:53:23 2011] [error] [client 192.168.10.10] PHP Warning:  include(./include/auth.php): failed to open stream: Permission denied in /usr/share/cacti/index.php on line 25
[Thu Jun 09 13:53:23 2011] [error] [client 192.168.10.10] PHP Warning:  include(): Failed opening './include/auth.php' for inclusion (include_path='.:/usr/share/php5:/usr/share/php5/PEAR') in /usr/share/cacti/index.php on line 25
[Thu Jun 09 13:53:23 2011] [error] [client 192.168.10.10] PHP Warning:  include(./include/top_header.php): failed to open stream: Permission denied in /usr/share/cacti/index.php on line 26
[Thu Jun 09 13:53:23 2011] [error] [client 192.168.10.10] PHP Warning:  include(): Failed opening './include/top_header.php' for inclusion (include_path='.:/usr/share/php5:/usr/share/php5/PEAR') in /usr/share/cacti/index.php on line 26
[Thu Jun 09 13:53:23 2011] [error] [client 192.168.10.10] PHP Fatal error:  Call to undefined function api_plugin_hook() in /usr/share/cacti/index.php on line 28