Some of the things on that privacy page (the first ones) are marked as essential. If you crossed any of those out , you won't see zilch. The ones further down the page are either "on" or "off". They are optional.
You may have problems while the pages are updated. I emailed HQ to tell them of my error messages and their reply said "Thanks for sending that across, but it's nothing to worry about - we were just having a quick tech update. Sorry for any inconvenience that was caused."
If I were you, I'd go and make a cup of tea, leaving GN turned off while you drink it. It'l probably be OK when you get back to it.