Message
Unexpected foo attribute on bar element
Explanation
Your feed contains elements with attributes that are not defined in the
relevant specifications. Perhaps this is a typo (remember that XML is
case-sensitive; for example, isPermalink and
isPermaLink have no relation to each other,
and only the latter has any meaning in the RSS 2.0 standard).
If you are trying to extend RSS, a new element in its own namespace is likely to be more flexible, and less liable to cause interoperability problems.
Solution
Correct the attributes, or move the information into a namespaced element.
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