（Ruby on rails）Twitterログインからの退会機能でエラーが出てしまいます。

Question

###前提・実現したいこと
Ruby on railsにてTwitterログインからの退会機能を作成しております。退会ボタンをおすと下記のメッセージが表示されてしまうのですが、対処方法をご教示頂けませんでしょうか？
何卒よろしくお願い致します。

###発生している問題・エラーメッセージ
Routing Error
undefined method ` before_action' for UsersController:Class

Rails.root: /Users/TOMOAKI/photolog

Application Trace | Framework Trace | Full Trace
app/controllers/users_controller.rb:2:in <class:UsersController>' app/controllers/users_controller.rb:1:in <top (required)>'
Routes

Routes match in priority from top to bottom

Helper HTTP Verb Path Controller#Action
Path / Url
Path Match
comments_path GET /comments(.:format) comments#index
POST /comments(.:format) comments#create
new_comment_path GET /comments/new(.:format) comments#new
edit_comment_path GET /comments/:id/edit(.:format) comments#edit
comment_path GET /comments/:id(.:format) comments#show
PATCH /comments/:id(.:format) comments#update
PUT /comments/:id(.:format) comments#update
DELETE /comments/:id(.:format) comments#destroy
new_user_session_path GET /users/sign_in(.:format) devise/sessions#new
user_session_path POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session_path DELETE /users/sign_out(.:format) devise/sessions#destroy
user_omniauth_authorize_path GET|POST /users/auth/:provider(.:format) users/omniauth_callbacks#passthru {:provider=>/twitter|facebook/}
user_omniauth_callback_path GET|POST /users/auth/:action/callback(.:format) users/omniauth_callbacks#(?-mix:twitter|facebook)
user_password_path POST /users/password(.:format) devise/passwords#create
new_user_password_path GET /users/password/new(.:format) devise/passwords#new
edit_user_password_path GET /users/password/edit(.:format) devise/passwords#edit
PATCH /users/password(.:format) devise/passwords#update
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration_path GET /users/cancel(.:format) devise/registrations#cancel
user_registration_path POST /users(.:format) devise/registrations#create
new_user_registration_path GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration_path GET /users/edit(.:format) devise/registrations#edit
PATCH /users(.:format) devise/registrations#update
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy
root_path GET / redirect(301, /photos)
photos_path GET /photos(.:format) photos#index
POST /photos(.:format) photos#create
new_photo_path GET /photos/new(.:format) photos#new
edit_photo_path GET /photos/:id/edit(.:format) photos#edit
photo_path GET /photos/:id(.:format) photos#show
PATCH /photos/:id(.:format) photos#update
PUT /photos/:id(.:format) photos#update
DELETE /photos/:id(.:format) photos#destroy
retire_user_path GET /user/retire(.:format) users#retire
user_path POST /user(.:format) users#create
new_user_path GET /user/new(.:format) users#new
edit_user_path GET /user/edit(.:format) users#edit
GET /user(.:format) users#show
PATCH /user(.:format) users#update
PUT /user(.:format) users#update
DELETE /user(.:format) users#destroy
Request

Parameters:

None
Toggle session dump
Toggle env dump
Response

Headers:

None

###app>users>users.contoller.rb

class UsersController < ApplicationController
 before_action :authenticate

  def retire
  end
  
def destroy
 if current_user.destroy
   reset_session
   redirect_to root_path, notice:'退会完了しました'
  else
   render :retire
  end	
 end


end

#config>routes.rb

Rails.application.routes.draw do
  resources :comments
  devise_for :users, controllers: { omniauth_callbacks: 'users/omniauth_callbacks' }
  root to: redirect('/photos')
  resources :photos
  resource :user do
    get 'retire'
  end

  # The priority is based upon order of creation: first created -> highest priority.
  # See how all your routes lay out with "rake routes".

  # You can have the root of your site routed with "root"
  # root 'welcome#index'

  # Example of regular route:
  #   get 'products/:id' => 'catalog#view'

  # Example of named route that can be invoked with purchase_url(id: product.id)
  #   get 'products/:id/purchase' => 'catalog#purchase', as: :purchase

  # Example resource route (maps HTTP verbs to controller actions automatically):
  #   resources :products

  # Example resource route with options:
  #   resources :products do
  #     member do
  #       get 'short'
  #       post 'toggle'
  #     end
  #
  #     collection do
  #       get 'sold'
  #     end
  #   end

  # Example resource route with sub-resources:
  #   resources :products do
  #     resources :comments, :sales
  #     resource :seller
  #   end

  # Example resource route with more complex sub-resources:
  #   resources :products do
  #     resources :comments
  #     resources :sales do
  #       get 'recent', on: :collection
  #     end
  #   end

  # Example resource route with concerns:
  #   concern :toggleable do
  #     post 'toggle'
  #   end
  #   resources :posts, concerns: :toggleable
  #   resources :photos, concerns: :toggleable

  # Example resource route within a namespace:
  #   namespace :admin do
  #     # Directs /admin/products/* to Admin::ProductsController
  #     # (app/controllers/admin/products_controller.rb)
  #     resources :products
  #   end
end

#app>models>user.rb

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable, :omniauthable
         has_many :photos, dependent: :nullify
         has_many :comments, dependent: :nullify


         def self.find_or_create_from_oauth(auth)
         User.find_or_create_by(provider: auth.provider, uid: auth.uid) do |user|
         user.user_name  = auth.info.nickname || auth.info.name
         user.avatar_url = auth.info.image
         user.email      = User.dummy_email(auth)
         user.password   = Devise.friendly_token[0, 20]
end
end
private

def self.dummy_email(auth)
"#{auth.uid}-#{auth.provider}@example.com"
end

end