Redmine

I need little information , for my, not work page "Settings" to open, i receive message : Internal error .

Is possible inform probable solution for this cause ? (i search in bug tracking/forum using google , but not found similary text)

Started GET "/settings" for 192.168.100.101 at 2016-08-24 16:05:08 -0300
Processing by SettingsController#index as HTML
  Current user: carlos.lopes (id=29)
Completed 500 Internal Server Error in 8.0ms

NoMethodError (undefined method `commit_update_keywords' for #<Class:0x000000033ada10>):
  app/controllers/settings_controller.rb:49:in `edit'
  app/controllers/settings_controller.rb:27:in `index'

Default administrator account changed     True
Attachments directory writable     True
Plugin assets directory writable     True
RMagick available (optional)     True

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Environment:
  Redmine version                2.4.2.stable
  Ruby version                   1.9.3-p551 (2014-11-13) [x86_64-linux]
  Rails version                  3.2.16
  Environment                    production
  Database adapter               PostgreSQL
SCM:
  Git                            2.7.4
  Filesystem                     
Redmine plugins:
  no plugin installed

• My frist language is pt-br (portuguese) is not problem i talk using english