Redmine

Hi, I have a problem with Redmine 3.3.1. When I click "new issue" I get "Internal error".
Could you help me?

Thanks!

Environment:
Redmine version 3.3.1.stable
Ruby version 2.1.9-p490 (2016-03-30) [i386-mingw32]
Rails version 4.2.7.1
Environment production
Database adapter SQLServer
Redmine plugins: no plugin installed

In my log:

ActionView::Template::Error (undefined method `accessor' for #<ActiveRecord::Type::Value:0xe638fb0>):
    15: <% end %>
    16: 
    17: <% if @issue.safe_attribute? 'assigned_to_id' %>
    18: <p><%= f.select :assigned_to_id, principals_options_for_select(@issue.assignable_users, @issue.assigned_to), :include_blank => true, :required => @issue.required_attribute?('assigned_to_id') %></p>
    19: <% end %>
    20: 
    21: <% if @issue.safe_attribute?('category_id') && @issue.project.issue_categories.any? %>
  app/models/role.rb:213:in `permissions_all_trackers'
  app/models/role.rb:222:in `permissions_all_trackers?'
  app/models/role.rb:228:in `permissions_tracker?'
  app/models/project.rb:532:in `block in assignable_users'
  app/models/project.rb:532:in `assignable_users'
  app/models/issue.rb:863:in `assignable_users'
  app/views/issues/_attributes.html.erb:18:in `block in _app_views_issues__attributes_html_erb__393947134_114367380'
  app/helpers/application_helper.rb:1058:in `labelled_fields_for'
  app/views/issues/_attributes.html.erb:1:in `_app_views_issues__attributes_html_erb__393947134_114367380'
  app/views/issues/_form.html.erb:42:in `block in _app_views_issues__form_html_erb__929292908_114867852'
  app/helpers/application_helper.rb:1058:in `labelled_fields_for'
  app/views/issues/_form.html.erb:1:in `_app_views_issues__form_html_erb__929292908_114867852'
  app/views/issues/new.html.erb:11:in `block in _app_views_issues_new_html_erb___904060764_115063068'
  app/helpers/application_helper.rb:1051:in `labelled_form_for'
  app/views/issues/new.html.erb:5:in `_app_views_issues_new_html_erb___904060764_115063068'
  app/controllers/issues_controller.rb:129:in `block (2 levels) in new'
  app/controllers/issues_controller.rb:128:in `new'
  lib/redmine/sudo_mode.rb:63:in `sudo_mode'