Tyring to use LinkedIn Gem

TryingToUseLinkedInGem.rb

require 'rubygems'
require 'linkedin'

client = LinkedIn::Client.new('api_key', 'api_secret')
rtoken = client.request_token.token
rsecret = client.request_token.secret

puts client.request_token.authorize_url

pin = gets

client.authorize_from_request(rtoken, rsecret, pin)

Edited.

Now I get the following:

C:/RubyStack-3.2.3-0/ruby/lib/ruby/gems/1.9.1/gems/oauth-0.4.6/lib/oauth/consume
r.rb:178:in request': additional_authorization_required (OAuth::Problem) from C:/RubyStack-3.2.3-0/ruby/lib/ruby/gems/1.9.1/gems/oauth-0.4.6/lib/ oauth/consumer.rb:194:intoken_request'
from C:/RubyStack-3.2.3-0/ruby/lib/ruby/gems/1.9.1/gems/oauth-0.4.6/lib/
oauth/tokens/request_token.rb:18:in get_access_token' from C:/RubyStack-3.2.3-0/ruby/lib/ruby/gems/1.9.1/gems/linkedin-0.3.7/l ib/linked_in/helpers/authorization.rb:29:inauthorize_from_request'
from authenticate.rb:14:in `

'

Do you have your api_key and api_secret on line 4? additional_authorization_required is the problem.