Fix the URLs not accessible error

The URLs not accessible error indicates that Google encountered an error when attempting to view a URL in your sitemap. You can read the HTTP error codes article for more information on this and other errors.
In general, you can take the one of the following approaches to resolve this error:

• Ensure that the file exists at the specified location.
• If we attempted to crawl the URL from your sitemap, make sure that your sitemap lists the URL correctly.
• If the file exists, your server may have returned an error when we tried to access the file.