WordPress MU

Hello
I have just begun to use WPMU and so far all is fine. However RSS Feeds have been quite problematic. I understand the technology but not how it works with WordPress.
Actions

Installed PowerPress Plug-In
Configured Settings
Selected Feeds
Selected Validate From Podcast Channel Feeds
Firstly url does not resolve http://mydomain/feed/podcast/

Note: as I can not find a folder for this I assuming this path is generated in the db OR The folders are simply not created ??

The following code was produced From Feed Validator.

<strong>Sorry</strong>

This feed does not validate.

Server returned HTTP Error 404: Not Found [help]

In addition, interoperability with the widest range of feed readers could be improved by implementing the following recommendations.

line 29, column 51: Image title doesn't match channel title [help]

<title>Blog Title » Page not found</title>
^
line 33, column 1: Missing recommended iTunes channel element: itunes:category [help]

</channel>
^
line 33, column 1: The recommended <itunes:email> element is missing [help]

</channel>
^
Source: http://mydomain.org/feed/podcast/

<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0"
xmlns:content="http://purl.org/rss/1.0/modules/content/"
xmlns:wfw="http://wellformedweb.org/CommentAPI/"
xmlns:dc="http://purl.org/dc/elements/1.1/"
xmlns:atom="http://www.w3.org/2005/Atom"
xmlns:sy="http://purl.org/rss/1.0/modules/syndication/"
xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
xmlns:itunes="http://www.itunes.com/dtds/podcast-1.0.dtd"
>

<channel>
<title>Blog Title</title>
<atom:link href="http://mydomain.org/feed/podcast/" rel="self" type="application/rss+xml" />
<link>http://mydomain.org</link>
<description>Southern Belizean weblogs</description>
<lastBuildDate>Sun, 13 Jun 2010 19:22:23 +0000</lastBuildDate>
<generator>http://wordpress.org/?v=2.9.2</generator>
<language>en</language>
<sy:updatePeriod>hourly</sy:updatePeriod>
<sy:updateFrequency>1</sy:updateFrequency>
<itunes:summary>Southern Belizean weblogs</itunes:summary>
<itunes:author>Ixchel Ha - Blogeeze</itunes:author>
<itunes:explicit>no</itunes:explicit>
<itunes:image href="http://mydomain.org/wp-content/plugins/powerpress/itunes_default.jpg" />
<itunes:subtitle>Southern Belizean weblogs</itunes:subtitle>
<image>
<title>Blog Title » Page not found</title>
<url>http://mydomain.org/wp-content/plugins/powerpress/rss_default.jpg</url>
<link>http://mydomain.org</link>
</image>
</channel>
</rss>

Can anyone help

Thanks Jonathan -

the blogs are virtual and dynamically generated. Some plugins aren't written with this in mind, and thus fail.

Thanks for the response
My options are?
Jonathan

Contact the plugin author to let him know.
or
Fix the plugin.

Or

Find a different plugin to do the same.

Good advice
Thank for your time Andrea

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