Albini1988 on "[Plugin: WordPress SEO by Yoast] 404 Error when trying to create a sitemap"

Im getting a 404 error when trying to create a sitemap using Yoast WordPress SEO

i have 2 wordpress sites installed on one domain. the sitemap im trying to create is for a sub-domain (which obviously has its own directory).

I know this works because i create a sitemap on my main domain earlier.

Please help.

http://wordpress.org/extend/plugins/wordpress-seo/