in adittion I can activate the virtual server but I am not using it right now (the virtual server) due to some issues like problems with error pages (not working)
Do you mean <VirtualHost>s?
What did you do to set it up?
Did you copy the ErrorDocument into the <VirtualHost>?
and for example the code you tell me about it dont' work on my apache configuration but works fine on the internet.
Where did you put the ./htaccess file? (Document root (htdocs/) or a sub directory (htdocs/mysite/)?)
Where is oldcats.php?
Sp here is my apache configuration may be you can find the missconfiguration issue;
I can't see anything wrong in that configuration file.