Отложенное задание выдает ошибку неопределенного метода

Отложенное задание (2.1.4) отлично работает на моей машине разработки, отправляя электронные письма с веселым энтузиазмом - однако при запуске на моем сервере с использованием Apache / Passenger (3.0.7) он терпит неудачу. Rails 3.0.7 и ruby ​​1.9.2 на обоих, кстати.

Я видел, что есть проблема при использовании thin, где задание создается следующим образом:

--- !ruby/struct:Delayed::PerformableMailer
object: !ruby/object:Class UserMailer

когда оно должно читать:

--- !ruby/struct:Delayed::PerformableMailer
object: !ruby/class UserMailer 

Мои созданы правильно на моей машине разработки, но неправильно при создании на сервере.

У кого-нибудь еще была эта проблема, где мне начать поиск?

Stacktrace:

{undefined method `standard_message' for #<Class:0xc6ad054>
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/performable_mailer.rb:6:in `perform'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/backend/base.rb:87:in `invoke_job'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:120:in `block (2 levels) in run'\n
/usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/timeout.rb:57:in `timeout'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:120:in `block in run'\n
/usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/benchmark.rb:309:in `realtime'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:119:in `run'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:177:in `reserve_and_run_one_job'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:104:in `block in work_off'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:103:in `times'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:103:in `work_off'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:78:in `block (2 levels) in start'\n
/usr/local/rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/benchmark.rb:309:in `realtime'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:77:in `block in start'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:74:in `loop'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/worker.rb:74:in `start'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/command.rb:104:in `run'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/command.rb:83:in `block in run_process'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/application.rb:249:in `call'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/application.rb:249:in `block in start_proc'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/daemonize.rb:199:in `call'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/daemonize.rb:199:in `call_as_daemon'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/application.rb:253:in `start_proc'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/application.rb:293:in `start'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/controller.rb:70:in `run'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons.rb:195:in `block in run_proc'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/cmdline.rb:109:in `call'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons/cmdline.rb:109:in `catch_exceptions'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/daemons-1.1.3/lib/daemons.rb:194:in `run_proc'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/command.rb:81:in `run_process'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/command.rb:75:in `block in daemonize'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/command.rb:73:in `times'\n
/home/safrea/site/shared/bundle/ruby/1.9.1/gems/delayed_job-2.1.4/lib/delayed/command.rb:73:in `daemonize'\n
script/delayed_job:5:in `<main>'