There was a problem with the request to Vodpod. This is most often caused by an error in your plugin settings. Please make sure that you used a valid vodpod account name and collection name. You can test this by putting the vodpod call directly into your browser:
http://api.vodpod.com/v2/users/hemerang/collections/hemerang2/videos.xml?api_key=1993b813d6cc8293&sort=ranking&per_page=1