Redmine

Maybe the detail of the error is logged in the log/production.log. Could you paste it?

!Started GET "/issues/18167" for 192.168.0.9 at 2019-06-21 11:48:22 +0300
Processing by IssuesController#show as HTML
Parameters: {"id"=>"18167"}
Current user: admin (id=1)
Rendered issues/_action_menu.html.erb (2.8ms)
Rendered issue_relations/_form.html.erb (0.6ms)
Rendered issues/_relations.html.erb (0.9ms)
Rendered issues/_history.html.erb (3.5ms)
Rendered issues/_action_menu.html.erb (1.1ms)
Rendered issues/_attributes.html.erb (3.3ms)
Rendered issues/_form.html.erb (15.2ms)
Rendered issues/_edit.html.erb (15.5ms)
Rendered issues/show.html.erb within layouts/base (34.3ms)
Completed 500 Internal Server Error in 538ms (ActiveRecord: 492.8ms)

ActionView::Template::Error (undefined method `accessor' for #<ActiveRecord::Type::Value:0x00007fed253b7558>):
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:229:in `permissions_all_trackers'
app/models/role.rb:238:in `permissions_all_trackers?'
app/models/role.rb:244:in `permissions_tracker?'
app/models/project.rb:559:in `block in assignable_users'
app/models/project.rb:559:in `assignable_users'
app/models/issue.rb:927:in `assignable_users'
app/views/issues/_attributes.html.erb:18:in `block in app_views_issues_attributes_html_erb___682704466992368240_70328248405080'
app/helpers/application_helper.rb:1197:in `labelled_fields_for'
app/views/issues/_attributes.html.erb:1:in `_app_views_issues__attributes_html_erb___682704466992368240_70328248405080'
app/views/issues/_form.html.erb:43:in `block in app_views_issues_form_html_erb__4241967776747092323_41085180'
app/helpers/application_helper.rb:1197:in `labelled_fields_for'
app/views/issues/_form.html.erb:1:in `_app_views_issues__form_html_erb__4241967776747092323_41085180'
app/views/issues/_edit.html.erb:8:in `block in app_views_issues_edit_html_erb___3133428117017170002_37341380'
app/helpers/application_helper.rb:1190:in `labelled_form_for'
app/views/issues/_edit.html.erb:1:in `_app_views_issues__edit_html_erb___3133428117017170002_37341380'
app/views/issues/show.html.erb:143:in `_app_views_issues_show_html_erb__3201281631344903642_70328085301040'
app/controllers/issues_controller.rb:107:in `block (2 levels) in show'
app/controllers/issues_controller.rb:100:in `show'
lib/redmine/sudo_mode.rb:63:in `sudo_mode'
!

Some tasks open correctly

not relevant. I deleted this system