I feel like I'm missing something really obvious here, but I have validated every XML doc on my site and yet when I follow the link to validate CSS I get this error every time. I am coming right off of the page that tells me I am VALID XHTML 1.0 Transitional, so I don't know how else to satisfy this requirement the CSS validator is requesting:

Please, validate your XML document first!

Line 1

Column 1

Content is not allowed in prolog.

Anybody get this?