hi my main site is www.mydomain.com and my blog is www.mydomain.com/blog/ i successfully submitted my first sitemap, which is for www.mydomain.com now, i created a new sitemap for my blog, which is located in /blog/ in google webmaster tools, when i tried to submit it, it tells me that the sitemap file must be located at www.mydomain.com, but i already have the first sitemap there. how to fix this?