Magento system.log 'Aviso: SimpleXMLElement' - (adminNotification / Model / Feed.php)

Magento me deixou perplexo de novo! Em /var/log/system.log, estou vendo os seguintes avisos e não consegui rastrear a causa. Seguindo o timestamp, parece que todos estão disparando ao mesmo tempo, então talvez seja uma ação específica que desencadeia as 24 linhas de avisos ... alguma idéia de como depurar?

2013-07-17T08:06:16+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: Entity: line 2: parser error : AttValue: &quot; or ' expected  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:16+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: &lt;html lang=en&gt;  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:16+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]:            ^  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:16+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: Entity: line 2: parser error : attributes construct error  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:16+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: &lt;html lang=en&gt;  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:16+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]:            ^  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:16+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: Entity: line 2: parser error : Couldn't find end of Start Tag html line 2  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:16+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: &lt;html lang=en&gt;  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:16+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]:            ^  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:16+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: Entity: line 2: parser error : Extra content at the end of the document  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:16+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: &lt;html lang=en&gt;  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:16+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]:            ^  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:21+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: Entity: line 2: parser error : AttValue: &quot; or ' expected  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:21+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: &lt;html lang=en&gt;  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:21+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]:            ^  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:21+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: Entity: line 2: parser error : attributes construct error  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:21+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: &lt;html lang=en&gt;  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:21+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]:            ^  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:21+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: Entity: line 2: parser error : Couldn't find end of Start Tag html line 2  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:21+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: &lt;html lang=en&gt;  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:21+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]:            ^  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:21+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: Entity: line 2: parser error : Extra content at the end of the document  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:21+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]: &lt;html lang=en&gt;  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173
2013-07-17T08:06:21+00:00 ERR (3): Warning: SimpleXMLElement::__construct() [<a href='simplexmlelement.--construct'>simplexmlelement.--construct</a>]:            ^  in /home/public_html/app/code/core/Mage/AdminNotification/Model/Feed.php on line 173

Parece que algo está quebrando o módulo de feed do adminhtml.

A causa pode ser um módulo de terceiros que está recuperando XML inválido.

Verifique se o código do site contém alguma classe que se estenda Mage_AdminNotification_Model_Feed.

Depois de encontrá-lo:

1. Tente desativar esse módulo (pol app/etc/modules/).
2. Limpe o system.log.
3. Veja se o erro se foi.

Repita esse processo para cada módulo. Depois de determinar qual módulo está criando o problema, você pode editá-lo config.xmle comentar o observador que aciona a notificação.

Também sugerirei entrar em contato com o desenvolvedor do módulo e notificá-lo sobre o problema.