[Plugin: Quick Cache ( Speed Without Compromise )] Sitemap HTTP Error

I am using your plugin and it is working fine. I checked into google webmastertools and noticed that on my sitemaps are an http error now.
well I checked your plugin settings and added the sitemaps urls into “Don’t Cache These Referrer Patterns:”
should this work or do you have any other suggestions?

http://wordpress.org/extend/plugins/quick-cache/