Https V.S Http on my website using the Agama Blue Theme

Hi there

I have a little problem with my website that started after the installation of the Agama Blue theme. Whenever you access my website using the “https” protocol, that is https://fadeville.co.uk, it does not load the home page. But the moment you remove the “s” from https to http://fadeville.co.uk, it does load the home page. What could be the problem and how do I fix it?

The page I need help with: [log in to see the link]