[Plugin: Sermon Browser] Podcast Links Not Working

Hello, I am using the Sermon Browser plugin, however anyone who knows podcasts well may be able to send me in the right direction. Both of my podcast subscribe links for regular subscription and itunes are not working. the sermon browser plugin generates my feed, however i am able to modify the xml in a php file if necessary.

when i go the itunes store to view my podcast, i click subscribe and it adds the podcast to my itunes. however, every mp3 file listed for my podcast says “Not Found” with an exclamation point next to the file