Sitemap.xml gives me a 404 error?

[MarketingChimp10]

I'm submitting a sitemap.xml on my client's website and am given this 404 error:

404

File not found

The site configured at this address does not contain the requested file.

If this is your site, make sure that the filename case matches the URL.
For root URLs (like http://example.com/) you must provide an index.html file.

Read the full documentation for more information about using GitHub Pages.

GitHub Status — @githubstatusIt is only a one page website. I've uploaded the .xml file through cyberduck directly to my server and haven't had issues with any of my other client's websites. Could this be a problem with my server?

[GlobeRunner]

I would check to see if you've uploaded the file to the right folder on the server. Some servers have a public_html folder and that's where you'd want to upload it to. If you are able to access other pages on the site but not this page in particular, then it might be a caching issue. Oftentimes ISPs will cache pages and you won't be able to see the latest version. You might try accessing it from another browser, or use something like Rex Swain's HTTP viewer (http://www.rexswain.com/httpview.html) to see if it loads there.