I will try to explain the situation: In December 2012 I deployed a website with a sitemap.xml, etc... there were circa 2000 URLs. After a while I changed something on my website, upgrading my pages ...
I am getting around 2,500 type 500 URL errors in Google webmaster tools. These pages are faceted navigation results that can not be reached by a site visitor. These pages do not exist. We are using ...