Ruby-on-rails – ActionController::RoutingError (undefined method `before_filter’ for Class): Error

Basically I have a UsersInitializeController Class

class UsersInitializeController < ApplicationController
  before_filter :authenticate_user!

  def create
    render true
  end
end

authenticate_user! is found in the Application Controller

class ApplicationController < ActionController::Base
  # protect_from_forgery

  def authenticate_user!
    @current_user = User.find_by_token params[:auth_token]
    if !@current_user
      @current_user = User.create :token => params[:auth_token]
    end
  end

end

When my application starts, it sends POST request to the UsersInitializeController. Since before_filter is set, it will thus call authenticate_user! first. However the error I got says before_filter is an undefined method.

From my knowledge, before_filter exist in ActionController, and since UsersInitializeContoller < ApplicationController < ActionController, I shouldn't be getting this error. Has anyone encounter this issue before ?

Exception Stack (as requested)

Started POST "/users_initialize.json" for 127.0.0.1 at 2012-03-06 00:32:50 -0800

ActionController::RoutingError (undefined method `before_filter' for UsersInitializeController:Class):
app/controllers/users_initialize_controller.rb:3:in `<class:UsersInitializeController>'
app/controllers/users_initialize_controller.rb:1:in `<top (required)>'

Routes.rb file (as requested)

MyApplication::Application.routes.draw do
 resources :users_initialize
 match 'info/required_client_version' => 'info#required_client_version'
end

### Problem Solved ###

Unused Devise Gem somehow causing the complication. Removed it and done.