OK, that's rather inexplicable. The only explanation could be (and this seems highly unlikely) that the Yahoo! library is looking at the URL (which is the only thing that is different) and doing something different based upon that.
At this point, you'll need to post an SSCE so that we can recreate the issue ourselves.
Joined: May 13, 2009
I changed the server name from localhost to my system , it is able to load the plugin. Strange but works fine now!!