This block has encountered an error and cannot be previewed

I’ve inherited a site and its errors. Every block in the editor shows “This block has encountered an error and cannot be previewed”. I am running WordPress 6.4.3, Gutenberg 17.6.0, LazyBlocks 3.5.1. We can make do in some cases but the front page is almost uneditable without sorting through the code. Here’s a screenshot of some of the blocks on the front page:

Any help will be very much appreciated!

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