Menu edit: 200 OK error

Hi everybody,

Unfortunately I am having some trouble with my wordpress site.
If I try to edit the menu, this error appears:

OK

The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

I’ve tried to give it some time, but this has been the issue since the beginning of the week. I hope you can help me out.
Thanks in advance.

Kind Regards,

Bjarne

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