XML validator

The W3C Markup Validation Service reports my website
(http://www.kendietz.com <http://www.kendietz.com> ) to be "not valid xml,"
but it doesn't generate any errors.  Has anyone seen this?  Other
validators, such as STG and Validome, say it validates ok.  
Any feedback appreciated.

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Photography by Ken Dietz
http://www.kendietz.com