Thread:Project:Support desk/error in google webmaster then run generateSitemap.php

Hi, I run generateSitemap.php by following code: php maintenance/generateSitemap.php \ --fspath sitemap \ --server http://mydomain.org \ --urlpath http://mydomain.org/sitemap in maintenance directory sitemao folder is created automatically, too me moved all file by extin xml.gz and .xml in sitemap in root directory in end google webmaster add sitemap by sitemap/sitemap-index-...._mediawiki.xml but receive Warnings URLs not accessible that:

''When we tested a sample of the URLs from your Sitemap, we found that some URLs were not accessible to Googlebot due to an HTTP status error. All accessible URLs will still be submitted''

is description this Warnings URLs not accessible.What I do?