未定义的方法user_omniauth_authorize_path for#<#< Class：0x0000000253a550>：0x000000035ea490>

我已经仔细检查了指南中的代码,我似乎无法弄清楚问题是什么.我的宝石：

source 'https://rubygems.org'

gem 'sendgrid'
gem 'omniauth-facebook'
gem 'gravatar'
gem 'will_paginate'
gem 'faker'
gem 'devise'
# Bundle edge Rails instead: gem 'rails',github: 'rails/rails'
gem 'rails','4.2.6'
# Use postgresql as the database for Active Record
gem 'pg','~> 0.15'
# Use SCSS for stylesheets
gem 'sass-rails','~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier','>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails','~> 4.1.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer',platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder','~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc','~> 0.4.0',group: :doc

# Use ActiveModel has_secure_password
# gem 'bcrypt','~> 3.1.7'

# Use Unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails',group: :development

group :development,:test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug'
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console','~> 2.0'
  gem 'letter_opener'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
end

OmniauthCallbacksController：

class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController



 def facebook

    @user = User.from_omniauth(request.env["omniauth"])

    if @user.persisted?
      sign_in_and_redirect @user,:event => :authentication
      set_flash_message(:notice,:success,:kind => "Facebook") if is_navigational_format?
    else
      session["devise.facebook_data"] = request.env["omniauth.auth"]
      redirect_to new_user_registration_url
    end
  end

  def failure
    redirect_to root_path
  end

end

用户型号：

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,:omniauth_providers => [:facebook]

  has_many :likings,dependent: :destroy
  has_many :comments,dependent: :destroy
  has_many :posts,dependent: :destroy
  has_many :active_relationships,class_name: "Relationship",foreign_key: "follower_id",dependent: :destroy
  has_many :passive_relationships,foreign_key: "followed_id",dependent: :destroy

  has_many :following,through: :active_relationships,source: :followed
  has_many :followers,through: :passive_relationships,source: :follower


  def Feed
    Post.where("user_id IN (?) OR user_id = ?",following_ids,id)
  end

  # follows user
  def follow(other_user)
    active_relationships.create(followed_id: other_user.id)
  end

  # unfollows user
  def unfollow(other_user)
    active_relationships.find_by(followed_id: other_user.id).destroy
  end

  def following?(other_user)
    following.include?(other_user)
  end

  def self.from_omniauth(auth)
    where(provider: auth.provider,uid: auth.uid).first_or_create do |user|
      user.email = auth.info.email
      user.password = Devise.friendly_token[0,20]
    end
  end
end