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 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.

Correct the attributes, or move the information into a namespaced element.