Error opening new hook form when custom fields exist

[cheoAlejo]

When I try to access New hook form ( Global hooks --> New hook ) an internal error ocurs. The error only happens when custom fields exist in the database, otherwise the form opens just fine.

production.log:

Processing by GlobalHooksController#new as HTML
  Current user: admin (id=1)
  Rendered plugins/redmine_undev_git/app/views/global_hooks/_form.html.erb (199.0ms)
  Rendered plugins/redmine_undev_git/app/views/global_hooks/new.html.erb within layouts/admin (203.7ms)
Completed 500 Internal Server Error in 239.3ms

ActionView::Template::Error (uninitialized constant Redmine::CustomFieldFormat):
    40:                     class: 'hook_assigned_to_id' %></p>
    41:
    42:     <% hook.custom_field_values.each do |value| %>
    43:       <p><%= hook_custom_field_value_tag_with_label :global_hook, value %></p>
    44:     <% end -%>
    45:   </fieldset>
    46: </div>
  app/helpers/application_helper.rb:1056:in `labelled_form_for'

My environment:

Environment:
  Redmine version                2.6.5.stable
  Ruby version                   2.0.0-p643 (2015-02-25) [x86_64-linux]
  Rails version                  3.2.21
  Environment                    production
  Database adapter               Mysql2
SCM:
  UndevGit                       1.9.1
  Git                            1.9.1
  Filesystem                     
Redmine plugins:
  progressive_projects_list      2.0.1
  quick_view                     0.1.0
  redmine_checklists             3.1.1
  redmine_dashboard              2.5.0
  redmine_default_members        1.0.0
  redmine_documents              1.0.0
  redmine_mail_reminder          2.6.5.0001
  redmine_my_page_queries        2.1.6
  redmine_people                 0.1.8
  redmine_questions              0.0.5
  redmine_silencer               0.4.0
  redmine_stats                  0.0.2
  redmine_sticky_messages        1.0.1
  redmine_tags                   2.1.0
  redmine_undev_git              0.2.10
  redrisk                        1.0.0