Error in HTML 5 Validator

The new Google+1 Button is coming up as an error in the HTML 5 validator:

 Validation Output: 1 Error

   1. [image: Warning] *Line 341, Column 42*: Element name g:plusone cannot
   be represented as XML 1.0.

           <div class="googleone"><g:plusone*>*</g:plusone></div>

    ✉<http://validator.w3.org/feedback.html?uri=http%3A%2F%2Fwww.rotapix.com%2F;errmsg_id=html5#errormsg>
   2. [image: Error] *Line 341, Column 42*: Element g:plusone not allowed as
   child of element div in this context. (Suppressing further errors from this
   subtree.)

           <div class="googleone"><g:plusone*>*</g:plusone></div>

    Content model for element
div<http://www.whatwg.org/specs/web-apps/current-work/#the-div-element>
   : Flow content<http://www.whatwg.org/specs/web-apps/current-work/#flow-content>



as seen on http://www.rotapix.com/


Thank you  ~



NOTE: Whenever possible, give the address of the document you were checking..



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