Not showing feed from subdomain

Hi,
We have installed this plugin on our main site and want to show the feed from our subdomain in a widget.

Our subdomain feed URL is http://stylemania.pearlypoppies.com/feed

However, the feed is not showing any results. It is showing the following error message: “There is a problem with the feeds you entered. Go to our support page and we’ll help you diagnose the problem.”
Please help us with this.

http://wordpress.org/plugins/wp-rss-multi-importer/