A copy of Shop has been removed from the module tree but is still active

gistfile1.txt

ArgumentError - A copy of Shop has been removed from the module tree but is still active!:
  activesupport (4.1.4) lib/active_support/dependencies.rb:465:in `load_missing_constant'
  activesupport (4.1.4) lib/active_support/dependencies.rb:180:in `const_missing'
   () Users/joelbrewer/Development/Repos/echome/app/models/shop.rb:9:in `retrieve'
  shopify_app (5.0.0) lib/shopify_app/shopify_session_repository.rb:10:in `retrieve'
   () Users/joelbrewer/Development/Repos/echome/app/controllers/surveys_controller.rb:4:in `index'
  actionpack (4.1.4) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
  actionpack (4.1.4) lib/abstract_controller/base.rb:189:in `process_action'
  actionpack (4.1.4) lib/action_controller/metal/rendering.rb:10:in `process_action'
  actionpack (4.1.4) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
  activesupport (4.1.4) lib/active_support/callbacks.rb:113:in `call'
  activesupport (4.1.4) lib/active_support/callbacks.rb:229:in `block in halting'
  activesupport (4.1.4) lib/active_support/callbacks.rb:166:in `block in halting'
  activesupport (4.1.4) lib/active_support/callbacks.rb:86:in `run_callbacks'
  actionpack (4.1.4) lib/abstract_controller/callbacks.rb:19:in `process_action'
  actionpack (4.1.4) lib/action_controller/metal/rescue.rb:29:in `process_action'
  actionpack (4.1.4) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
  activesupport (4.1.4) lib/active_support/notifications.rb:159:in `block in instrument'
  activesupport (4.1.4) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
  activesupport (4.1.4) lib/active_support/notifications.rb:159:in `instrument'
  actionpack (4.1.4) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
  actionpack (4.1.4) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
  activerecord (4.1.4) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
  actionpack (4.1.4) lib/abstract_controller/base.rb:136:in `process'
  actionview (4.1.4) lib/action_view/rendering.rb:30:in `process'
  actionpack (4.1.4) lib/action_controller/metal.rb:196:in `dispatch'
  actionpack (4.1.4) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
  actionpack (4.1.4) lib/action_controller/metal.rb:232:in `block in action'
  actionpack (4.1.4) lib/action_dispatch/routing/route_set.rb:82:in `dispatch'
  actionpack (4.1.4) lib/action_dispatch/routing/route_set.rb:50:in `call'
  actionpack (4.1.4) lib/action_dispatch/journey/router.rb:71:in `block in call'
  actionpack (4.1.4) lib/action_dispatch/journey/router.rb:59:in `call'
  actionpack (4.1.4) lib/action_dispatch/routing/route_set.rb:678:in `call'
  newrelic_rpm (3.8.1.221) lib/new_relic/rack/error_collector.rb:55:in `call'
  newrelic_rpm (3.8.1.221) lib/new_relic/rack/agent_hooks.rb:32:in `call'
  newrelic_rpm (3.8.1.221) lib/new_relic/rack/browser_monitoring.rb:27:in `call'
  newrelic_rpm (3.8.1.221) lib/new_relic/rack/developer_mode.rb:45:in `call'
  omniauth (1.2.2) lib/omniauth/strategy.rb:186:in `call!'
  omniauth (1.2.2) lib/omniauth/strategy.rb:164:in `call'
  omniauth (1.2.2) lib/omniauth/builder.rb:59:in `call'
  rack (1.5.2) lib/rack/etag.rb:23:in `call'
  rack (1.5.2) lib/rack/conditionalget.rb:25:in `call'
  rack (1.5.2) lib/rack/head.rb:11:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/flash.rb:254:in `call'
  rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
  rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/cookies.rb:560:in `call'
  activerecord (4.1.4) lib/active_record/query_cache.rb:36:in `call'
  activerecord (4.1.4) lib/active_record/connection_adapters/abstract/connection_pool.rb:621:in `call'
  activerecord (4.1.4) lib/active_record/migration.rb:380:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
  activesupport (4.1.4) lib/active_support/callbacks.rb:82:in `run_callbacks'
  actionpack (4.1.4) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/reloader.rb:73:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
  better_errors (1.1.0) lib/better_errors/middleware.rb:84:in `protected_app_call'
  better_errors (1.1.0) lib/better_errors/middleware.rb:79:in `better_errors_call'
  better_errors (1.1.0) lib/better_errors/middleware.rb:56:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
  railties (4.1.4) lib/rails/rack/logger.rb:38:in `call_app'
  railties (4.1.4) lib/rails/rack/logger.rb:20:in `block in call'
  activesupport (4.1.4) lib/active_support/tagged_logging.rb:68:in `block in tagged'
  activesupport (4.1.4) lib/active_support/tagged_logging.rb:26:in `tagged'
  activesupport (4.1.4) lib/active_support/tagged_logging.rb:68:in `tagged'
  railties (4.1.4) lib/rails/rack/logger.rb:20:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/request_id.rb:21:in `call'
  rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
  rack (1.5.2) lib/rack/runtime.rb:17:in `call'
  activesupport (4.1.4) lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call'
  rack (1.5.2) lib/rack/lock.rb:17:in `call'
  actionpack (4.1.4) lib/action_dispatch/middleware/static.rb:64:in `call'
  rack (1.5.2) lib/rack/sendfile.rb:112:in `call'
  railties (4.1.4) lib/rails/engine.rb:514:in `call'
  railties (4.1.4) lib/rails/application.rb:144:in `call'
  rack (1.5.2) lib/rack/lock.rb:17:in `call'
  rack (1.5.2) lib/rack/content_length.rb:14:in `call'
  rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
   () Users/joelbrewer/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
   () Users/joelbrewer/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
   () Users/joelbrewer/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'