Hello, Roger, and welcome.
First, the error you’re receiving is actually a “500 internal server error”, which is likely 1 of the most unhelpful error messages ever to be invented by humankind, simply because it tells you almost nothing.
Having thus said, in WordPress, the usual cause is either a bad connection to the database or a theme that’s not working.
The other thing I noticed, however, is that there are some problems w/your DNS nameservers, which may or may not have anything to do w/the error you’re receiving.
DNS stands for domain name system. When I type singingforhealthandhappiness.co.uk into my address bar, the first thing that happens is that my computer actually goes to something called a DNS name server to translate singingforhealthandhappiness.co.uk into an internet address known as an IP address. In your case, that’s 198.251.83.18, because computers really like numbers a whole lot better than words. Think of it like a phone directory of sorts. Each domain needs 2 nameservers, 1 of which is considered a parent. If there are problems, it can certainly interfere, especially with obtaining security certificates.
Here is the problem report, and I suggest you contact your host to see if they can help you resolve these difficulties:
“
Status Problem
ResponsePrimary Name Server Not Listed At Parent
ns1-da01.magnointernet.com
StatusStatus Warning
ResponseLocal NS list does not match Parent NS list
198.251.83.18 was reported by the parent, but not locally
199.195.250.40 was reported by the parent, but not locally
198.251.83.18 was reported locally, but not by the parent
199.195.250.40 was reported locally, but not by the parent
StatusStatus Warning
ResponseName Servers are on the Same Subnet
198.251.83
199.195.250
The second problem is because your nameservers are on the same network. This won’t impact the operation of your domain, though the first one might. Tell your host that this information was obtained from mxtoolbox.com. Whether or not it’s related to the problem at hand, it should nonetheless get fixed.
So I guess in order to fix this, I need to know what you have your disposal in terms of services & whether you know how to use them. First, do you have any kind of control panel on that server? 2nd, do you know how to use secure FTP?
Let’s see how you reply, which will hopefully allow me to provide some suggestions for moving forward.