Running the Zend Framework application on shared hosting, which is also a subdomain

I create a Zend Framework application using the Zend tool and run it on my own XAMPP installation and the XAMPP home server (both windows). Now I am moving it to the linux sharing environment. I tried this method and some of the methods it refers to by modifying .htaccess and / or links in index.php. But I keep getting 500 eras. Pages that require a login give me a login form, but this also gives a 500 error.

I don’t understand why this is happening, but it is assumed that the shared hosting server acts as a subdomain of another URL. Could this be a problem or should I look at some other factors?

Thanks in advance!