Redmine

I have upgraded redmine from 2.1.2 to 2.2.0 and I get the following error when I try to open Administration/Settings:

Started GET "/settings" for 192.168.0.174 at Mon Dec 24 12:07:39 +0100 2012
Processing by SettingsController#index as HTML
Current user: nikola.vidovic (id=60)
Rendered settings/_general.html.erb (10.8ms)
Rendered settings/_display.html.erb (12.2ms)
Rendered settings/_authentication.html.erb (9.3ms)
Rendered settings/_projects.html.erb (10.0ms)
Rendered settings/_issues.html.erb (3.8ms)
Rendered common/_tabs.html.erb (55.5ms)
Rendered settings/edit.html.erb within layouts/admin (56.6ms)
Completed 500 Internal Server Error in 67ms

ActionView::Template::Error (undefined method `cross_project_subtasks' for #<Class:0x7f2b807d4f58>):
3: <div class="box tabular settings">
4: <p><%= setting_check_box :cross_project_issue_relations ></p>
5:
6: <p><= setting_select :cross_project_subtasks, cross_project_subtasks_options ></p>
7:
8: <p><= setting_check_box :issue_group_assignment %></p>
9:
app/helpers/settings_helper.rb:39:in `send'
app/helpers/settings_helper.rb:39:in `setting_select'
app/views/settings/_issues.html.erb:6:in `_app_views_settings__issues_html_erb___1557619823_69912405967060'
app/views/settings/_issues.html.erb:1:in `_app_views_settings__issues_html_erb___1557619823_69912405967060'
app/views/common/_tabs.html.erb:24:in `_app_views_common__tabs_html_erb__1050759135_69912404140040'
app/views/common/_tabs.html.erb:23:in `each'
app/views/common/_tabs.html.erb:23:in `_app_views_common__tabs_html_erb__1050759135_69912404140040'
app/helpers/application_helper.rb:263:in `render_tabs'
app/views/settings/edit.html.erb:3:in `_app_views_settings_edit_html_erb___599449337_69912404581660'
app/controllers/settings_controller.rb:26:in `index'

Here is ruby info:

Ruby version 1.8.7 (x86_64-linux)
RubyGems version 1.8.15
Rack version 1.4
Rails version 3.2.9
Active Record version 3.2.9
Action Pack version 3.2.9
Active Resource version 3.2.9
Action Mailer version 3.2.9
Active Support version 3.2.9
Middleware ActionDispatch::Static, Rack::Lock, #<ActiveSupport::Cache::Strategy::LocalCache::Middleware:0x7f703f7d1fe8>, Rack::Runtime, Rack::MethodOverride, ActionDispatch::RequestId, Rails::Rack::Logger, ActionDispatch::ShowExceptions, ActionDispatch::DebugExceptions, ActionDispatch::RemoteIp, ActionDispatch::Reloader, ActionDispatch::Callbacks, ActiveRecord::ConnectionAdapters::ConnectionManagement, ActiveRecord::QueryCache, ActionDispatch::Cookies, ActionDispatch::Session::CookieStore, ActionDispatch::Flash, ActionDispatch::ParamsParser, ActionDispatch::Head, Rack::ConditionalGet, Rack::ETag, ActionDispatch::BestStandardsSupport, OpenIdAuthentication
Application root /var/www/redmine
Environment development
Database adapter mysql
Database schema version 20121026003537

Using Apache with passenger.