当我尝试登录应用程序时，我在浏览器中收到以下错误声明：
undefined method `attachment_definitions' for #<Class:0x007f800e91e840>
这在终端：
Processing by Devise::SessionsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"eriPHHi/FGBOFOpDidHQ0WGHeT6P6rx6OobOlI3yVVc=", "lsd"=>"AVpgheCi", "user"=>{"email"=>"email@gmail.com", "password"=>"[FILTERED]", "remember_me"=>"0"}, "commit"=>"", "timezone"=>"420", "lgnrnd"=>"174002_RDjg", "lgnjs"=>"1372034619", "locale"=>"en_US"}
User Load (89.7ms) SELECT "users".* FROM "users" WHERE "users"."email" = 'mail@gmail.com' LIMIT 1
(0.1ms) begin transaction
(86.1ms) UPDATE "users" SET "last_sign_in_at" = '2013-07-23 14:33:24.674379', "current_sign_in_at" = '2013-07-24 14:31:20.626373', "sign_in_count" = 16, "updated_at" = '2013-07-24 14:31:20.633644' WHERE "users"."id" = 11
(55.2ms) rollback transaction
Completed 500 Internal Server Error in 694ms
NoMethodError (undefined method `attachment_definitions' for #<Class:0x007f800e91e840>):
activerecord (3.2.9) lib/active_record/dynamic_matchers.rb:50:in `method_missing'
randumb (0.4.0) lib/randumb/relation.rb:164:in `method_missing'
delayed_paperclip (2.6.0.0) lib/delayed_paperclip/attachment.rb:24:in `delayed_options'
delayed_paperclip (2.6.0.0) lib/delayed_paperclip/attachment.rb:29:in `delay_processing?'
delayed_paperclip (2.6.0.0) lib/delayed_paperclip/attachment.rb:69:in `block in save_with_prepare_enqueueing'
delayed_paperclip (2.6.0.0) lib/delayed_paperclip/attachment.rb:68:in `tap'
delayed_paperclip (2.6.0.0) lib/delayed_paperclip/attachment.rb:68:in `save_with_prepare_enqueueing'
paperclip (3.5.0) lib/paperclip/has_attached_file.rb:75:in `block in add_active_record_callbacks'
activesupport (3.2.9) lib/active_support/callbacks.rb:416:in `_run__273581649550948589__save__1608755943708162097__callbacks'
activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.9) lib/active_support/callbacks.rb:385:in `_run_save_callbacks'
activesupport (3.2.9) lib/active_support/callbacks.rb:81:in `run_callbacks'
activerecord (3.2.9) lib/active_record/callbacks.rb:264:in `create_or_update'
activerecord (3.2.9) lib/active_record/persistence.rb:84:in `save'
activerecord (3.2.9) lib/active_record/validations.rb:50:in `save'
activerecord (3.2.9) lib/active_record/attribute_methods/dirty.rb:22:in `save'
activerecord (3.2.9) lib/active_record/transactions.rb:259:in `block (2 levels) in save'
activerecord (3.2.9) lib/active_record/transactions.rb:313:in `block in with_transaction_returning_status'
activerecord (3.2.9) lib/active_record/connection_adapters/abstract/database_statements.rb:192:in `transaction'
activerecord (3.2.9) lib/active_record/transactions.rb:208:in `transaction'
newrelic_rpm (3.6.5.130) lib/new_relic/agent/method_tracer.rb:518:in `block in transaction_with_trace_ActiveRecord_self_name_transaction'
newrelic_rpm (3.6.5.130) lib/new_relic/agent/method_tracer.rb:268:in `trace_execution_scoped'
newrelic_rpm (3.6.5.130) lib/new_relic/agent/method_tracer.rb:513:in `transaction_with_trace_ActiveRecord_self_name_transaction'
activerecord (3.2.9) lib/active_record/transactions.rb:311:in `with_transaction_returning_status'
activerecord (3.2.9) lib/active_record/transactions.rb:259:in `block in save'
activerecord (3.2.9) lib/active_record/transactions.rb:270:in `rollback_active_record_state!'
activerecord (3.2.9) lib/active_record/transactions.rb:258:in `save'
devise (3.0.0) lib/devise/models/trackable.rb:30:in `update_tracked_fields!'
devise (3.0.0) lib/devise/hooks/trackable.rb:7:in `block in <top (required)>'
warden (1.2.3) lib/warden/hooks.rb:14:in `call'
warden (1.2.3) lib/warden/hooks.rb:14:in `block in _run_callbacks'
warden (1.2.3) lib/warden/hooks.rb:9:in `each'
warden (1.2.3) lib/warden/hooks.rb:9:in `_run_callbacks'
warden (1.2.3) lib/warden/manager.rb:53:in `_run_callbacks'
warden (1.2.3) lib/warden/proxy.rb:179:in `set_user'
warden (1.2.3) lib/warden/proxy.rb:323:in `_perform_authentication'
warden (1.2.3) lib/warden/proxy.rb:127:in `authenticate!'
devise (3.0.0) app/controllers/devise/sessions_controller.rb:15:in `create'
actionpack (3.2.9) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (3.2.9) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.2.9) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.2.9) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.2.9) lib/active_support/callbacks.rb:469:in `_run__1416762379271609182__process_action__4449580587613085988__callbacks'
activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.9) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks'
activesupport (3.2.9) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.9) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.2.9) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.2.9) lib/active_support/notifications.rb:123:in `block in instrument'
activesupport (3.2.9) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (3.2.9) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.9) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.2.9) lib/action_controller/metal/params_wrapper.rb:207:in `process_action'
activerecord (3.2.9) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
newrelic_rpm (3.6.5.130) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:38:in `block in process_action'
newrelic_rpm (3.6.5.130) lib/new_relic/agent/instrumentation/controller_instrumentation.rb:318:in `perform_action_with_newrelic_trace'
newrelic_rpm (3.6.5.130) lib/new_relic/agent/instrumentation/rails3/action_controller.rb:37:in `process_action'
actionpack (3.2.9) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.2.9) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.2.9) lib/action_controller/metal.rb:203:in `dispatch'
actionpack (3.2.9) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.2.9) lib/action_controller/metal.rb:246:in `block in action'
actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:73:in `call'
actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:36:in `call'
actionpack (3.2.9) lib/action_dispatch/routing/mapper.rb:42:in `call'
journey (1.0.4) lib/journey/router.rb:68:in `block in call'
journey (1.0.4) lib/journey/router.rb:56:in `each'
journey (1.0.4) lib/journey/router.rb:56:in `call'
actionpack (3.2.9) lib/action_dispatch/routing/route_set.rb:601:in `call'
omniauth (1.1.4) lib/omniauth/strategy.rb:184:in `call!'
omniauth (1.1.4) lib/omniauth/strategy.rb:164:in `call'
omniauth (1.1.4) lib/omniauth/builder.rb:49:in `call'
newrelic_rpm (3.6.5.130) lib/new_relic/rack/error_collector.rb:12:in `call'
newrelic_rpm (3.6.5.130) lib/new_relic/rack/agent_hooks.rb:22:in `call'
newrelic_rpm (3.6.5.130) lib/new_relic/rack/browser_monitoring.rb:16:in `call'
newrelic_rpm (3.6.5.130) lib/new_relic/rack/developer_mode.rb:28:in `call'
warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
warden (1.2.3) lib/warden/manager.rb:34:in `catch'
warden (1.2.3) lib/warden/manager.rb:34:in `call'
actionpack (3.2.9) 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:35:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.2.9) 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 (3.2.9) lib/action_dispatch/middleware/cookies.rb:341:in `call'
activerecord (3.2.9) lib/active_record/query_cache.rb:64:in `call'
activerecord (3.2.9) lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `_run__911033713188350571__call__1608755943708162097__callbacks'
activesupport (3.2.9) lib/active_support/callbacks.rb:405:in `__run_callback'
activesupport (3.2.9) lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
activesupport (3.2.9) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.2.9) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/reloader.rb:65:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
railties (3.2.9) lib/rails/rack/logger.rb:32:in `call_app'
railties (3.2.9) lib/rails/rack/logger.rb:16:in `block in call'
activesupport (3.2.9) lib/active_support/tagged_logging.rb:22:in `tagged'
railties (3.2.9) lib/rails/rack/logger.rb:16:in `call'
actionpack (3.2.9) 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 (3.2.9) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.4.5) lib/rack/lock.rb:15:in `call'
actionpack (3.2.9) lib/action_dispatch/middleware/static.rb:62:in `call'
railties (3.2.9) lib/rails/engine.rb:479:in `call'
railties (3.2.9) lib/rails/application.rb:223:in `call'
rack (1.4.5) lib/rack/content_length.rb:14:in `call'
railties (3.2.9) lib/rails/rack/log_tailer.rb:17:in `call'
rack (1.4.5) lib/rack/handler/webrick.rb:59:in `service'
/Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service'
/Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run'
/Users/radek/.rvm/rubies/ruby-1.9.3-p385/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'
Rendered /Users/radek/.rvm/gems/ruby-1.9.3-p385/gems/actionpack-3.2.9/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.8ms)
Rendered /Users/radek/.rvm/gems/ruby-1.9.3-p385/gems/actionpack-3.2.9/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (1.3ms)
Rendered /Users/radek/.rvm/gems/ruby-1.9.3-p385/gems/actionpack-3.2.9/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (42.7ms)
我第一次看到这样的东西，Devise有什么问题？从哪里开始调试/开始寻找错误？
非常感谢，我解决了这个问题超过 2 小时，仍然没有...