Error when I submit sitemap on google

Hi there.
I have installed the sitemap mod and when i add that xml url in my webmaster tools it says:
Network unreachable: Network unreachable
HTTP Error: 500
How can ii fix it please?
0
Hi there.
I have installed the sitemap mod and when i add that xml url in my webmaster tools it says:
Network unreachable: Network unreachable
HTTP Error: 500
How can ii fix it please?