Error encountered while trying to add feed

When I try to submit my podcast feed, I keep receiving an error email from iTunes post-submission. The feed in question is:

http://runezone.com/runetalk/rss.xml

It functions without issue when testing it in iTunes, as well as not bringing up any errors during the submission process - it's only after they confirm it's been received and is awaiting approval that I get the email consisting of

"Dear podcast owner,

An error was encountered while trying to add your feed, [ http://runezone.com/runetalk/rss.xml ].

Please correct the error and submit your feed again. For additional information, please consult the podcast FAQ at http://www.apple.com/itunes/podcasts/faq.html and technical specification at http://www.apple.com/itunes/podcasts/techspecs.html."

Is there anything incorrect with this XML? It validates fine in all feed validators, and I've checked it against the Specs at http://www.apple.com/itunes/podcasts/specs.html and none of the common errors hold - there's no out-of-place entities, pubDate's in the right format, and all ampersands are accounted for. The categories all check out too.

The podcast files themselves also run fine when manually added to iTunes - the links in the XML are 302 redirects to the actual files, and that seems to work without issue normally.