[Rails] Re: ROR setup on ubuntu machine

I followed this link  for integrate with twittter
http://cbpowell.wordpress.com/2011/03/17/twitter-oauth-and-ruby-on-rails-integrated-cookbook-style-in-the-console-updated-for-twitter-1-0/

but when i give this  in console i got the error like  this

>client = Twitter::Client.new
#<Twitter::Client:0x971a79c @adapter=:net_http, @consumer_key=nil, @consumer_secret=nil, @endpoint="https://api.twitter.com/", @format=:json, @gateway=nil, @oauth_token=nil, @oauth_token_secret=nil, @proxy=nil, @search_endpoint="https://search.twitter.com/", @user_agent="Twitter Ruby Gem 1.7.2", @media_endpoint="https://upload.twitter.com/", @faraday_options={}>

>client.update('Test post from the console')

Twitter::Unauthorized: POST https://api.twitter.com/1/statuses/update.json: 401: Could not authenticate you.
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/twitter-1.7.2/lib/faraday/response/raise_http_4xx.rb:12:in `on_complete'
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/faraday-0.7.5/lib/faraday/response.rb:9:in `block in call'
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/faraday-0.7.5/lib/faraday/response.rb:62:in `on_complete'
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/faraday-0.7.5/lib/faraday/response.rb:8:in `call'
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/faraday-0.7.5/lib/faraday/request/url_encoded.rb:14:in `call'
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/faraday-0.7.5/lib/faraday/request/multipart.rb:13:in `call'
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/twitter-1.7.2/lib/faraday/request/multipart_with_file.rb:18:in `call'
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/faraday-0.7.5/lib/faraday/connection.rb:207:in `run_request'
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/faraday-0.7.5/lib/faraday/connection.rb:94:in `post'
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/twitter-1.7.2/lib/twitter/request.rb:27:in `request'
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/twitter-1.7.2/lib/twitter/request.rb:10:in `post'
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/twitter-1.7.2/lib/twitter/client/tweets.rb:45:in `update'
    from (irb):23
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands/console.rb:45:in `start'
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands/console.rb:8:in `start'
    from /home/cyberpro/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands.rb:40:in `<top (required)>'
    from script/rails:6:in `require'

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