Google Sitemap Error - Paths don't match

Google Sitemap Error - "Paths don't match"

Generally the sitemap will be output using the domain you requested it with : so if you request the sitemap with www.domainname.com, the output should come out with the www prefix in the sitemap.

So if you used www when adding site in google,the sitemap should also have the content with www.Otherwise it will show this error.