sitemap no urls issue

[Jntu Hub]

Hello,
recently i have installed 4.2.2 on my new site www.forum.jntudesk.com

in webmaster tools i am getting an error
"Your Sitemap does not contain any URLs. Please validate and resubmit your Sitemap ". but when i try to download sitemap there is content and if i resubmit its working.. and problem rising every day

i use rewrite url.. whtz the prob with sitemaps.. i have google .. many vb users facing this.. but i dint found any solution yet?

[adbn]

Try fetch as google bot the sitemap to see what happen.

[Jntu Hub]

Nothing happening.. showing as success? where are the main Support team to reply?..