Hi friends I submitted XML sitemap to Google webmaster two weeks before, but now it shows me an error URLs unreachable When we tested a sample of the URLs from your Sitemap, we found that some of the URLs were unreachable. Please check your webserver for possible misconfiguration, as these errors may be caused by a server error (such as a 5xx error) or a network error between Googlebot and your server. All reachable URLs will still be submitted. What is the problem with URL, what can i do for that?
it means that the urls are either blocked or dont exist there should be a ligt of them some where try clicking one and finding out what it says when you click the link then post us back and we might help