I have been using this site to generate sitemaps for months now and they have always been succesful. However, slowly and one by one in my Webmaster Tools they are coming up with errors..
Unsupported file format
Your Sitemap does not appear to be in a supported format. Please ensure that it meets our Sitemap guidelines and resubmit
I have done everything correct as far as I know, I am using the uncompressed versions.
Here is one sitemap that has errors apparently:
[external links are visible to admins only]
Any help would be very appreciated as pulling my hair out now!