twitterログインでエラーが出ます。

###前提・実現したいこと
Ruby on Ralisにて、Twitterログイン機能を作成しております。

###発生している問題・エラーメッセージ
Twitterログインのボタンを押すと下記のメッセージが出るのですが、どのように対処するべきでしょうか？

###Config>routes.rb

ruby
1Rails.application.routes.draw do
2  
3  #devise_for :users ,controllers: { omniauth_callbacks: 'users/omniauth_callbacks' }
4  #resources :photos
5  root to: 'welcome#index'
6  get '/auth/:provider/callback' => 'sessions#create'
7  # get 'welcome/index'
8
9  # get 'welcome/index'
10  # The priority is based upon order of creation: first created -> highest priority.
11  # See how all your routes lay out with "rake routes".
12
13  # You can have the root of your site routed with "root"
14  # root 'welcome#index'
15
16  # Example of regular route:
17  #   get 'products/:id' => 'catalog#view'
18
19  # Example of named route that can be invoked with purchase_url(id: product.id)
20  #   get 'products/:id/purchase' => 'catalog#purchase', as: :purchase
21
22  # Example resource route (maps HTTP verbs to controller actions automatically):
23  #   resources :products
24
25  # Example resource route with options:
26  #   resources :products do
27  #     member do
28  #       get 'short'
29  #       post 'toggle'
30  #     end
31  #
32  #     collection do
33  #       get 'sold'
34  #     end
35  #   end
36
37  # Example resource route with sub-resources:
38  #   resources :products do
39  #     resources :comments, :sales
40  #     resource :seller
41  #   end
42
43  # Example resource route with more complex sub-resources:
44  #   resources :products do
45  #     resources :comments
46  #     resources :sales do
47  #       get 'recent', on: :collection
48  #     end
49  #   end
50
51  # Example resource route with concerns:
52  #   concern :toggleable do
53  #     post 'toggle'
54  #   end
55  #   resources :posts, concerns: :toggleable
56  #   resources :photos, concerns: :toggleable
57
58  # Example resource route within a namespace:
59  #   namespace :admin do
60  #     # Directs /admin/products/* to Admin::ProductsController
61  #     # (app/controllers/admin/products_controller.rb)
62  #     resources :products
63  #   end
64end
65

#app>users>sessions_controller.rb

ruby
1class SessionsController < ApplicationController
2  def create
3   user = User.find_or_create_from_auth_hash(request.env['omniauth.auth'])
4   session[:user_id] = user.id
5   redirect_to root_path, notice: 'ログインしました'
6  end
7end

#models>user.rb

ruby
1class User < ActiveRecord::Base
2  # Include default devise modules. Others available are:
3  # :confirmable, :lockable, :timeoutable and :omniauthable
4  devise :database_authenticatable, :registerable,
5         :recoverable, :rememberable, :trackable, :validatable, :omniauthable
6
7 def self.find_or_create_from_auth_hash(auth_hash)
8 	provider = auth_hash[:provider]
9 	uid = auth_hash[:uid]
10 	nickname = auth_hash[:info][:nickname]
11 	image_url = auth_hash[:info][:image]
12
13 	User.find_or_create_by(provider: provider, uid: uid) do |user|
14 		user.nickname = nickname
15 		user.image_url = image_url
16 	 end
17 	end
18 end
19
20
21
22
23
24 
25  #def self.find_or_create_from_oauth(auth)
26    # User.find_or_create_by(provider: auth.provider, uid: auth.uid) do |user|
27     # user.user_name   = auth.info.nickname
28     # user.avatar_url = auth.info.image
29     # user.email      = User.dummy_email(auth)
30     # user.password   = Devise.friendly_token[0, 20]
31    # end
32  # end
33
34  # private
35
36  #def self.dummy_email(auth)
37   # "#{auth.uid}-#{auth.provider}@example.com"
38  #end
39

#db>migrate>20160125104011_devise_create_users.rb

ruby
1class DeviseCreateUsers < ActiveRecord::Migration
2  def change
3    create_table(:users) do |t|
4      ## Database authenticatable
5      t.string :email,              null: false, default: ""
6      t.string :encrypted_password, null: false, default: ""
7
8      ## Recoverable
9      t.string   :reset_password_token
10      t.datetime :reset_password_sent_at
11
12      ## Rememberable
13      t.datetime :remember_created_at
14
15      ## Trackable
16      t.integer  :sign_in_count, default: 0, null: false
17      t.datetime :current_sign_in_at
18      t.datetime :last_sign_in_at
19      t.string   :current_sign_in_ip
20      t.string   :last_sign_in_ip
21
22      ## Confirmable
23      # t.string   :confirmation_token
24      # t.datetime :confirmed_at
25      # t.datetime :confirmation_sent_at
26      # t.string   :unconfirmed_email # Only if using reconfirmable
27
28      ## Lockable
29      # t.integer  :failed_attempts, default: 0, null: false # Only if lock strategy is :failed_attempts
30      # t.string   :unlock_token # Only if unlock strategy is :email or :both
31      # t.datetime :locked_at
32
33
34      t.timestamps null: false
35    end
36
37    add_index :users, :email,                unique: true
38    add_index :users, :reset_password_token, unique: true
39    # add_index :users, :confirmation_token,   unique: true
40    # add_index :users, :unlock_token,         unique: true
41  end
42end
43