Podpress feed encoding error

I have been successfully using Podpress 8.8.10.17 for quite a while. This week my listeners told me that the feed to iTunes wasn’t working. I checked it out and it is not. No configuration changes in 6+ weeks and this is what I am getting at http://podcast.ethanbearman.com/?feed=podcast

This page contains the following errors:
error on line 324 at column 20: Encoding error
Below is a rendering of the page up to the first error.

When I copy and paste the text into an editor there is no formatting to determine line 324 column 20.

I cannot figure out what is happening. I deactivated and reactivated the plugin with no change and am unsure what to check.

Please advise.

Thanks,
-Ethan

http://wordpress.org/plugins/podpress/