Yeah, I subscribed and got an error too. Which is disappointing, because
Feed Validator gives it the all clear.
Given that you are using Wordpress, the error could be a number of things, some of which may be hard to figure out. But my best guess is that it has something to do with the fact that the size of your MP3 file has been specified incorrectly. In the code of your feed, the enclosure tag says length="1" when it should be length="14065000". The duration of your file has also been identified incorrectly. The tag looks like this: <itunes:duration>00:01:01</itunes:duration> when it should look like this: <itunes:duration>00:30:00</itunes:duration>. You should be able to fix both of these problems by telling Wordpress how many KB or MB your file is, and also how long it plays for. So, I would try to fix those two things first. If they don't work, the error may be caused by Wordpress using CDATA in your feed, which I have no idea how to go about changing.
Good luck and let us know how it goes.
P.S. Be sure to reset your episode limit to its max (like 100) because if you don't, once you reach past 5 episodes Wordpress will start making your older episodes disappear.