Our script is located at:
http://subdomain.domain.com/folder1/folder2/

In the setup wizard debugging is installed properly on the server.

When it asks for the document root we put:
/home/user/public_html/subdomain/

For the URL we put:
http://subdomain.domain.com/

We then choose "Web document tree contains a sub-directory that corresponds to the project root".

Then for the project URL we put:
http://subdomain.domain.com/folder1/folder2/

We then get an error "unexpected file is executed"

dbg-sample.php loads fine when we go here in our browser:
http://subdomain.domain.com/folder1/folder2/dbg-sample.php

What is wrong?