Rails - May 2011 - Fbgraph

Hi All,
 Am new to rails ,am using fbgraph gem in rails 3 having the follwoing error

{
   "error": {
      "type": "OAuthException",
      "message": "Invalid redirect_uri: Given URL is not allowed
by
the Application configuration."
   }
}


In my controller,


  def start
    redirect_to client.authorization.authorize_url(:redirect_uri => "
http://localhost:3000/" , :scope =>
''email,user_photos,friends_photos,publish_stream'')
  end

i want to post,poke to friends via my app ,is any other plugin available for
this .


Thanks in advance

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