I cant get Google site maps going!! Help needed!!!

My domain name, www.sriraminhell.tk is hosted by Freewebspace.com. When
i try to get my site verified, i get the following error : NOT
VERIFIED
We've detected that your 404 (file not found) error page returns
a status of 200 (OK) in the header.

We've detected that your 404 (file not found) error page returns a
status of 200 (OK) in the header. This configuration presents a
security risk for site verification and therefore, we can't verify your
site. If your web server is configured to return a status of 200 in the
header of 404 pages, and we enabled you to verify your site with this
configuration, others would be able to take advantage of this and
verify your site as well. This would allow others to see your site
statistics. To ensure that no one can take advantage of this
configuration to view statistics to sites they don't own, we only
verify sites that return a status of 404 in the header of 404 pages.

Please modify your web server configuration to return a status of 404
in the header of 404 pages. Note that we do a HEAD request (and not a
GET request) when we check for this. Once your web server is configured
correctly, try to verify the site again. If your web server is
configured this way and you receive this error, click Check Status
again and we'll recheck your configuration.