Error: playback failed

What's the fix for iTunes U's error:playbck failed?

I can't test it on the Podcasts app as I don't have an iOS device. The URL given for the media file is
http://torontogospel.com/sermons?show&file_name=Ptr.mp3
In fact it's http://torontogospel.com/sermons?show&file_name=Ptr.mp3 but you can't have an ampersand by itself in XML.
and this redirects to
http://torontogospel.com/wp-content/uploads/sermons/Ptr.mp3
which is the actual file URL. Although it works OK in iTunes when subscribing, and in the Store, it's possible that this redirect is upsetting the Podcasts app. It would be better to use the actual URL in the feed - the server does handle byte-range requests so it should work in the Podcasts app.

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