[Orgmode] org-feed not working for codeproject

[zwz]

I have the feed 
("codeproject"
         "http://www.codeproject.com/webservices/articlerss.aspx?cat=2";
         "~/feeds.org" "C++ on CodeProject")
in the org-feed-alist.

Everytime I update the feed, I got a new headline "* codeproject" added
into the file feeds.org without any new items.

It is weird and I do not know why.