I am currently getting this same error and validating the fix in Google Search Console doesn’t resolve it. I went in and made some changes to the schemas, hoping that would help, but it did not. (FYI, the instructions here are out of date, as the sitelinks option is under Search Appearance, not General: https://aioseo.com/docs/how-to-get-google-to-display-the-sitelinks-search-box/.)
Same problem exactly here. Sucuri did not create the file sucuri-settings.php. It does not have 755 permissions on that folder and file, but still I get the error.
I have the same problem and the solution did not fix it for me. It had 5 posts set, and I changed it to 10, but no dice. I am also a Divi user, using the latest versions of everything.