As this forces itunes to authenticate with PolishPod101's user account which I do not have,
I had to remove this podcast subscription from itunes.
Please look into this issue.
itpc://www.koreanclass101.com/premium_feed/feed.xml
<title>PolishPod101.com | Premium Feed</title>
<link>http://www.PolishPod101.com</link>
<description>Get ALL the Lessons Audio, Bonus Audio and PDF files in the PolishPod101.com Premium Feed!</description>
<pubDate>Mon, 29 Jan 2007 10:46:18 +0000</pubDate>