[wp-trac] [WordPress Trac] #4255: XML parsing error: <unknown>:1:1: not well-formed (invalid token)

[WordPress Trac]

#4255: XML parsing error:  <unknown>:1:1: not well-formed (invalid token)
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 Reporter:  mayuxi   |       Owner:  anonymous                      
     Type:  defect   |      Status:  new                            
 Priority:  normal   |   Milestone:  2.4                            
Component:  XML-RPC  |     Version:  2.1.3                          
 Severity:  major    |    Keywords:  rss, xml, syntax, feed, invalid
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 What is wrong?
 [http://validator.w3.org/feed/check.cgi?url=http%3A%2F%2Fmagazeta.com%2Ffeed%2F]
 {{{
 This feed does not validate.
     *
       line 1, column 1: XML parsing error: <unknown>:1:1: not well-formed
 (invalid token) [help]
           <?xml version="1.0" encoding="UTF-8"?>
 }}}

 I just registred at FeedBurner and install FeedSmith FeedBurner plugin...
 and this error apear. When I deactivate this plugin - error still apear.

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Ticket URL: <http://trac.wordpress.org/ticket/4255>
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