Server error

hi,
I'm trying to create a pricetapestry in a subfolder but I get a server error.

I want to install pricetapestry as following:
http://www.mywebsite.com/pt/

I adjusted the config.php to:
$config_baseHREF = "/pt/";

Also the .htaccess in http://www.mywebsite.com/pt/ into:
RewriteBase /aanbieding/
and removed the line with Options -MultiViews

But when I go to http://www.mywebsite.com/pt/setup.php I get a server error...

The real url is {link saved}