Hi,
Looks like your server doesn't support one thing in terms of PHP. But no worry.
Open this PHP file:
/homepages/7/d226936076/htdocs/florenza/templates/florenza/html/mod_virtuemart_cart/default.php
And look at the 27th line, and you will see this:
$document = &JFactory::getDocument();
and change it with this:
$document = JFactory::getDocument();
You should be good to go.