Ruby on Rails

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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