Message

A channel should not include both foo and bar

Explanation

Your channel contains two elements which mean the same thing. This can occur in RSS 2.0 when you mix core elements and namespace elements. This can confuse news aggregators and RSS parsers, since there are no universally accepted rules about which element takes precedence.

Examples of channel elements that mean the same thing:

language and dc:language

copyright and dc:copyright

generator and admin:generatorAgent

Solution

Remove one of the redundant elements.

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