Content not displaying

I want to correct some spelling mistakes on my WP website.

Normally I would log in, find the page and edit it.
But when I do so now no content is displayed and all I see is an empty block at the top.

The pages will exist on my viewable site but not when I edit that page.
This happens on all pages.

I guess it must be something to do with blocks that appears new

Any thoughts

Steve

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