Redmine

I get an internal error trying to access "My account" page in Redmine. But after reloading the page there is no internal error and I can access the page. Here is the information from Redmine log:

Processing MyController#account (for 91.90.15.48 at 2011-09-26 01:10:20) [GET] Parameters: {"action"=>"account", "controller"=>"my"} Rendering template within layouts/base Rendering my/account

ActionView::TemplateError (uninitialized constant ActiveSupport::TimeZone::TZInfo) on line #3 of app/views/users/_preferences.html.erb: 1: <% fields_for :pref, @user.pref, :builder => TabularFormBuilder, :lang => current_language do |pref_fields| %> 2:

<%= pref_fields.check_box :hide_mail %>

3:
<%= pref_fields.select :time_zone, ActiveSupport::TimeZone.all.collect {|z| [ z.to_s, z.name ]}, :include_blank => true %>

4:
<%= pref_fields.select :comments_sorting, [[l(:label_chronological_order), 'asc'], [l(:label_reverse_chronological_order), 'desc']] %>

5:
<%= pref_fields.check_box :warn_on_leaving_unsaved %>

6: <% end %>
app/views/users/_preferences.html.erb:3
app/views/users/_preferences.html.erb:1
app/views/my/account.rhtml:40:in
_run_rhtml_app47views47my47account46rhtml' app/views/my/account.rhtml:8:in _run_rhtml_app47views47my47account46rhtml' passenger (2.2.15) lib/phusion_passenger/rack/request_handler.rb:92:in process_request' passenger (2.2.15) lib/phusion_passenger/abstract_request_handler.rb:207:inmain_loop' passenger (2.2.15) lib/phusion_passenger/railz/application_spawner.rb:441:in start_request_handler' passenger (2.2.15) lib/phusion_passenger/railz/application_spawner.rb:381:in handle_spawn_application' passenger (2.2.15) lib/phusion_passenger/utils.rb:252:in safe_fork' passenger (2.2.15) lib/phusion_passenger/railz/application_spawner.rb:377:in handle_spawn_application' passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:352:in __send__' passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:352:in main_loop' passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:196:in start_synchronously' passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:163:in start' passenger (2.2.15) lib/phusion_passenger/railz/application_spawner.rb:222:in start' passenger (2.2.15) lib/phusion_passenger/railz/framework_spawner.rb:291:in handle_spawn_application' passenger (2.2.15) lib/phusion_passenger/abstract_server_collection.rb:126:in lookup_or_add' passenger (2.2.15) lib/phusion_passenger/railz/framework_spawner.rb:286:in handle_spawn_application' passenger (2.2.15) lib/phusion_passenger/abstract_server_collection.rb:80:in synchronize' passenger (2.2.15) lib/phusion_passenger/abstract_server_collection.rb:79:in synchronize' passenger (2.2.15) lib/phusion_passenger/railz/framework_spawner.rb:284:in handle_spawn_application' passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:352:in send' passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:352:in main_loop' passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:196:in start_synchronously' passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:163:in start' passenger (2.2.15) lib/phusion_passenger/railz/framework_spawner.rb:101:instart' passenger (2.2.15) lib/phusion_passenger/spawn_manager.rb:253:in spawn_rails_application' passenger (2.2.15) lib/phusion_passenger/abstract_server_collection.rb:126:in lookup_or_add' passenger (2.2.15) lib/phusion_passenger/spawn_manager.rb:247:in spawn_rails_application' passenger (2.2.15) lib/phusion_passenger/abstract_server_collection.rb:80:in synchronize' passenger (2.2.15) lib/phusion_passenger/abstract_server_collection.rb:79:in synchronize' passenger (2.2.15) lib/phusion_passenger/spawn_manager.rb:246:in spawn_rails_application' passenger (2.2.15) lib/phusion_passenger/spawn_manager.rb:145:in spawn_application' passenger (2.2.15) lib/phusion_passenger/spawn_manager.rb:278:in handle_spawn_application' passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:352:in __send__' passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:352:in main_loop' passenger (2.2.15) lib/phusion_passenger/abstract_server.rb:196:in `start_synchronously'

Rendering /home/eosweb/rails_apps/Redmine/public/500.html (500 Internal Server Error)

Processing TimeTrackersController#render_menu (for 95.81.29.50 at 2011-09-26 01:10:26) [POST] Parameters: {"action"=>"render_menu", "authenticity_token"=>"Shjxnqzbk2l3hFzHQIAoibBQLfgKwmOnC5p0XMh4P/g=", "controller"=>"time_trackers"} Completed in 14ms (View: 10, DB: 1) | 200 OK [http://redmine.eos-soft.com/time_trackers/render_menu]

Processing MyController#account (for 91.90.15.48 at 2011-09-26 01:10:32) [GET] Parameters: {"action"=>"account", "controller"=>"my"} Rendering template within layouts/base Rendering my/account Completed in 49ms (View: 46, DB: 0) | 200 OK [http://redmine.eos-soft.com/my/account]

What can be wrong?