we removed the screenshot from your post because it’s a public forum and anyone can see your posts.
We checked your website, the problem is the massive number of plugins you use. You website memory is not big enough to handle all data, i.e. when you save a post. You can try it: deactivate a plugin, i.e. Yoast SEO plugin, try it again and you will see it works. You can do now 2 things: ask your hosting provider to increase the memory (recommended) or reduce the number of plugins (we recommend you also this step, such an enormous number of plugins causes always problems!).