Unexpected foo attribute on bar element
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 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.
Correct the attributes, or move the information into a namespaced element.
Not clear? Disagree?
You might be able to find help in one of these fine resources.