Uninitialized constant CGI::Session::MemCacheStore

Rails
1

I am getting this error with Rails 1.2.3, while I was trying to change
session from active_record_store to use memcache-client 1.3.

Here is my error, I have checked that
actionpack-1.13.3\lib\action_controller\session\mem_cache_store.rb is
present. I tried everything and I am completely stuck. Please help!
Greatly appreciated.

thanks a lot!
-Krates

============= error ==============================
C:\sw\ruby\lib\ruby\gems\1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:477:in
const_missing': uninitialized constant CGI::Session::MemCacheStore (NameError) from C:\sw\ruby\lib\ruby\gems\1.8/gems/actionpack-1.13.3/lib/action_controller/session_management.rb:22:inconst_get’
from
C:\sw\ruby\lib\ruby\gems\1.8/gems/actionpack-1.13.3/lib/action_controller/session_management.rb:22:in
session_store=' from C:\sw\ruby\lib\ruby\gems\1.8/gems/rails-1.2.3/lib/initializer.rb:328:insend’
from
C:\sw\ruby\lib\ruby\gems\1.8/gems/rails-1.2.3/lib/initializer.rb:328:in
initialize_framework_settings' from C:\sw\ruby\lib\ruby\gems\1.8/gems/rails-1.2.3/lib/initializer.rb:327:ineach’
from
C:\sw\ruby\lib\ruby\gems\1.8/gems/rails-1.2.3/lib/initializer.rb:327:in
initialize_framework_settings' from C:\sw\ruby\lib\ruby\gems\1.8/gems/rails-1.2.3/lib/initializer.rb:324:ineach’
from
C:\sw\ruby\lib\ruby\gems\1.8/gems/rails-1.2.3/lib/initializer.rb:324:in
initialize_framework_settings' ... 20 levels... from C:\sw\ruby\lib\ruby\gems\1.8/gems/activesupport-1.4.2/lib/active_support/dependencies.rb:495:inrequire’
from ./script/server:3
from -e:4:in `load’
from -e:4

=========== environment.rb ===============
require_gem ‘memcache-client’
Rails::Initializer.run do |config|
config.action_controller.session_store =:mem_cache_store
end
memcache_options = {
:compression => true,
:debug => false,
:namespace => “pr-#{RAILS_ENV}”,
:readonly => false,
:urlencode => false
}
memcache_servers = [ ‘127.0.0.1:11211’ ]
CACHE = MemCache.new(memcache_options)
CACHE.servers = memcache_servers
ActionController::Base.session_options[:cache] = CACHE