Podcasting-subscribe podcast is not working

Hey,
I added the plugin podcasting on my blog. I already published the first episode but i cant subscribe the podcast. I really dont know what i did wrong. when i click on the feed icon in the addressbar i can choose subscribe podcast but it doesnt work…It alway appears mistake 404- not found. could u maybe check http://www.racing-aktuell.de the article is called. News 21.Januar 2009