backtrace

undefined local variable or method `session' for #<Devise::FailureApp:0x00000005a421d0>


devise (3.2.2) lib/devise/controllers/store_location.rb:38:in `store_location_for'
devise (3.2.2) lib/devise/failure_app.rb:194:in `store_location!'
devise (3.2.2) lib/devise/failure_app.rb:57:in `redirect'
devise (3.2.2) lib/devise/failure_app.rb:39:in `respond'
actionpack (3.2.6) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.6) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.6) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.6) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.6) lib/action_controller/metal.rb:246:in `block in action'
devise (3.2.2) lib/devise/failure_app.rb:22:in `call'
devise (3.2.2) lib/devise/failure_app.rb:22:in `call'
devise (3.2.2) lib/devise/delegator.rb:5:in `call'
warden (1.2.3) lib/warden/manager.rb:130:in `call_failure_app'
warden (1.2.3) lib/warden/manager.rb:116:in `process_unauthenticated'
warden (1.2.3) lib/warden/manager.rb:47:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.4.5) lib/rack/etag.rb:23:in `call'
rack (1.4.5) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/head.rb:14:in `call'
remotipart (1.2.1) lib/remotipart/middleware.rb:27:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/flash.rb:242:in `call'
rack (1.4.5) lib/rack/session/abstract/id.rb:210:in `context'
rack (1.4.5) lib/rack/session/abstract/id.rb:205:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/cookies.rb:338:in `call'
activerecord (3.2.6) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.6) lib/active_record/connection_adapters/abstract/connection_pool.rb:473:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `_run__3668435042865878402__call__193626258384159542__callbacks'
activesupport (3.2.6) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.6) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.6) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.6) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
rails-dev-tweaks (1.1.0) lib/rails_dev_tweaks/granular_autoload/middleware.rb:34:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
better_errors (1.1.0) lib/better_errors/middleware.rb:58:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.6) lib/rails/rack/logger.rb:26:in `call_app'
railties (3.2.6) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.6) lib/action_dispatch/middleware/request_id.rb:22:in `call'
rack (1.4.5) lib/rack/methodoverride.rb:21:in `call'
rack (1.4.5) lib/rack/runtime.rb:17:in `call'
activesupport (3.2.6) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.5) lib/rack/lock.rb:15:in `call'
rack-cache (1.2) lib/rack/cache/context.rb:136:in `forward'
rack-cache (1.2) lib/rack/cache/context.rb:245:in `fetch'
rack-cache (1.2) lib/rack/cache/context.rb:185:in `lookup'
rack-cache (1.2) lib/rack/cache/context.rb:66:in `call!'
rack-cache (1.2) lib/rack/cache/context.rb:51:in `call'
railties (3.2.6) lib/rails/engine.rb:479:in `call'
railties (3.2.6) lib/rails/application.rb:220:in `call'
railties (3.2.6) lib/rails/railtie/configurable.rb:30:in `method_missing'
passenger (4.0.33) lib/phusion_passenger/rack/thread_handler_extension.rb:77:in `process_request'
passenger (4.0.33) lib/phusion_passenger/request_handler/thread_handler.rb:141:in `accept_and_process_next_request'
passenger (4.0.33) lib/phusion_passenger/request_handler/thread_handler.rb:109:in `main_loop'
passenger (4.0.33) lib/phusion_passenger/request_handler.rb:440:in `block (3 levels) in start_threads'

routes.rb

  
  devise_for :users, :controllers => {:registrations => 'registrations', :sessions => 'sessions', :omniauth_callbacks => 'users/omniauth_callbacks'}
  # Logged in User scope
  namespace :users, path: '/u/' do
    get '/', :controller => 'users', :action => 'show'
  end

users_controller.rb

class UsersController < ApplicationController

  before_filter :authenticate_user!

  def show
    
  end

end

bear in mind I'm not on Rails 4 so I'm still using before_filter