Ruby on Rails

Trying to add authlogic in a simple project but get the error;

Showing app/views/layouts/application.html.erb where line #33 raised:
undefined method `underscore' for nil:NilClass
Extracted source (around line #33):
30: <div id="mainleft">
31: <ul class="menu">
32: <li><%= nav_link "Home", "site", "index" %></li>
33: <% if current_user %>
34: <li>The site</li>
35: <% else %>
36: <li><%= nav_link "Login", "authentications", "login"
%></li>

class ApplicationController < ActionController::Base
protect_from_forgery
filter_parameter_logging :password, :password_confirmation
helper_method :current_user

private
def current_user_session
return @current_user_session if defined?(@current_user_session)
@current_user_session = Authentication.find
end

def current_user
return @current_user if defined?(@current_user)
@current_user = current_user_session &&
current_user_session.user
end

authentication model
class Authentication < Authlogic::Session::Base
authenticate_with User
end

user model
class User < ActiveRecord::Base
acts_as_authentic do |c|
c.session_class = Authentication
c.login_field = :login
c.ignore_blank_passwords = false
end
end

routes in routes.rb
map.root :controller => "site", :action => "index"
map.resource :authentications
map.resources :users

map.login "login", :controller =>"authentications", :action =>
"login"
map.logout "logout", :controller =>"authentications", :action =>
"destroy"

The problem is in ApplicationController
@current_user_session = Authentication.find
Authentication is not active? I have config.gem "authlogic" in
environment.rb file.

Any ideas?

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