Podcast Feed Won't Validate

Podcast Feed: [login to view URL] When I run it on [login to view URL] I get this error: FATAL: Found blank lines at the top of your RSS feed that may have been added by a theme or plugin. The feed is invalid. Did not finish feed tests. Troubleshooting that has been completed - All plugins have been disabled, problem still contines - Cleared all of the cache and disable caching - Changed themes, still persists Video walk through: [login to view URL] If you can fix this, please let me know