title: Spree uninitialized constant Spree::UserSessionsController
body: <p>Am having a problem with Spree where I'm getting Spree uninitialized constant Spree::UserSessionsController when I try to go to the /admin page.
  I am redirected to /login and it errors.</p>
  
  <pre><code>Started GET "/admin" for 127.0.0.1 at 2014-07-22 20:26:22 +1000
  Processing by Spree::Admin::OrdersController#index as HTML
    Spree::Preference Load (2.4ms)  SELECT "spree_preferences".* FROM "spree_preferences" WHERE "spree_preferences"."key" = 'spree/backend_configuration/locale' LIMIT 1
  Redirected to http://localhost:3000/login
  Completed 302 Found in 499ms (ActiveRecord: 14.4ms)
  
  
  Started GET "/login" for 127.0.0.1 at 2014-07-22 20:26:22 +1000
  
  ActionController::RoutingError - uninitialized constant Spree::UserSessionsController:
    actionpack (4.0.3) lib/action_dispatch/routing/route_set.rb:69:in `rescue in controller'
    actionpack (4.0.3) lib/action_dispatch/routing/route_set.rb:64:in `controller'
  </code></pre>
  
  <p>I am using spree 2.2. Gemfile is</p>
  
  <pre><code>gem 'rails', '4.0.3'
  gem 'pg'
  gem 'sass-rails', '~&gt; 4.0.2'
  gem 'uglifier', '&gt;= 1.3.0'
  gem 'coffee-rails', '~&gt; 4.0.0'
  gem 'jquery-rails'
  gem 'turbolinks'
  gem 'jbuilder', '~&gt; 1.2'
  gem 'unicorn'
  gem 'spree_gateway', :git =&gt; 'https://github.com/spree/spree_gateway.git', :branch =&gt; '2-2-stable'
  gem 'spree_auth_devise', :git =&gt; 'https://github.com/spree/spree_auth_devise.git', :branch =&gt; '2-2-stable'
  gem 'spree', '2.2.0'
  gem 'spree_bootstrap_frontend', github: '200Creative/spree_bootstrap_frontend', branch: '2-2-stable'
  gem 'spree_blogging_spree', github: 'stefansenk/spree-blogging-spree', :branch =&gt; '2-2-stable'
  gem 'spree_editor', github: 'spree/spree_editor', :branch =&gt; '2-2-stable'
  gem 'spree_print_invoice' , :git =&gt; 'git://github.com/spree/spree_print_invoice.git', :branch =&gt; '2-2-stable'
  </code></pre>
  
  <p>I have double-checked spree.rb in the initializers folder. 
  It has the standard <code>Spree.user_class = "Spree::User"</code></p>
  
  <p>All the routes and controllers I'm using are stock standard so not sure on what is causing this error. Any help would be greatly appreciated.</p>