Rapidcart pro not opening products in pages throws 'ERR_EMPTY_RESPONSE'

So I recently began learning Rapidcart Pro, and reading the manual, however it says that it’s going to auto generate the pages for my products - but throws ‘ERR_EMPTY_RESPONSE’ when I click details on a product? Am I missing a setting or an option to have those pages generate? PHP is 5.3 on the site, I checked.

Please contact us at http://help.4gnd.com reporting the link to a test page.