Opencloud not working

Hi all,
I recently tried to install Owncloud on my NAS and whenever i go to open the UI it keeps on coming up with this:

It is running on a fresh install of Rockstor and the only other add-on i have is the HTTP to HTTPS redirect. I have the owncloud port set to 8080. Is it something that i have done or is it looking for something that i have not got installed\enabled on my NAS?

Thanks for your help.