Not found message

I have been indexed by Google with the word “feed” added to the end of my urls, which I have been told by support is fine, but when I go to the page it has a not found message on it where I assume the post should be. Can anyone advise me on what I need to do to fix this one. Here is a page

http://www.tradeshowpromotions.biz/TradeShowNews/7/maine-agriculture-trade-show-2005/feed/

Thanks