Problems with my theme

I’m having a lot of problems with my site https://deirdreannroberts.dk and I’m utterly gutted by the fact that I can not seem to find the problem.

Here is what I know.

1. I’m using the latest version of www.ads-software.com (4.4.1)
2. I have a self hosted site via UNO Euro.
3. I have uninstalled all my plugins
4. I have just (again) gotten a new theme

The thing is, my site used to work fine, leaving comments, viewing old posts etc. Now there is an error every time someone wants to leave a comment or open an old post etc. I thought first that it might be the theme, but after changing themes 4 times and even buying a theme to get around the free themes (as I thought the problem might be there) I still have the same problems.

So now I have deleted everything from my site, I have scrubbed it down to just this one free theme (Adelle from Bluchic) but the flaw is still there, which means it can not be the theme (again) that is failing.

So WHAT CAN IT BE???

I’m willing to pay for support and I’m willing to pay to get help, the problem is, as long as I don’t know what it is that is wrong with my site, it is kinda hard to go and ask for help.

Can anyone in here might guide me a bit? Thanks you a million times!