Rails - Sep 2008 - undefined method `authenticate_with_http_basic' for #<SessionsController:0xb6c47c44>

I am developing the rails with the flex.. I am following the tutorial
FLEXIBLE RAILS - PETER ARMSTRONG .
I followed the commands as specified in the tutorial.. my rails version is
1.2.3
and the ruby 1.8.6

I created the restful authentication and i specified the authentication..
ruby script\generate authenticated user sessions
...output omitted...

I specified everything.. It worked fine upto 500 pages..
later,
class SessionsController < ApplicationController
  # Be sure to include AuthenticationSystem in Application Controller
instead
  #  include AuthenticatedSystem
 skip_before_filter :login_required


He told me to comment the authenticated system and use skip_before.. i done
it and the
" include AuthenticatedSystem " line added to the application.rb
file...
now i created the new migration tasks and created the controller
when i need to access the link '' http://localhost:3000/session
''
it is throwing the exception

undefined method `authenticate_with_http_basic'' for
#<SessionsController:0xb6c47c44>

I changed the rails version and tried (2.0.1)
and i reloded the authentication in the application..
and tried in many ways but i can''t find the solution
Can Anybody Please help me regarding this error.. where i am doing worng...

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