Server Error (5xx) (e.g., a 503 Service Unavailable error) are shown when a valid request was made by the client, but the server failed to complete the request. This can indicate a problem with the server, and should be investigated and fixed. Is it your own server?
I see, then you can create a robots.txt file in public_html directory and add the following in it: User-Agent: * Disallow: Disallow: /wp-includes/sodium_compat/namspaced/Core/ This way, google bot should stop indexing this directory
@gedarnet that htaccess code will only stop showing a default index page in browser. Apache's default page which shows list of all files in a folder. Google already has the URLs of the files in that folder. It will keep trying to access them unless you tell google not to access, using robots.txt file. Use the @FaveHosting answer to stop the indexing of those folders and files.
@gedarnet Telling you again, that htaccess code is simply hiding the apache default page which shows file list if index.html, index.php etc is not present. Google already has file URLS in your folders, and it will come again, trying to index them and those errors will come up again. robots.txt is the permanent solution for this problem.