What are Crawl Errors?
Crawl errors are issues that prevent search engine crawler bots from crawling your site. They are further split into site and URL errors.
Site Errors: Site errors are issues that prevent search engine crawler bots from crawling your entire site. Examples include DNS errors and server connectivity errors.
URL Errors: URL errors are issues that prevent search engine crawler bots from crawling specific pages on your site. Examples include 404 Not Found errors and other errors resulting from access restrictions.