Redmine

Started GET "/redmine/projects/chinastockreceiver/documents" for 127.0.0.1 at 2019-12-27 20:12:30 +0800
Processing by DocumentsController#index as HTML
Parameters: {"project_id"=>"chinastockreceiver"}
Current user: xuxf (id=17)
Rendered attachments/_form.html.erb (15.7ms)
Rendered documents/_form.html.erb (31.3ms)
Rendered documents/index.html.erb within layouts/base (31.3ms)
Completed 500 Internal Server Error in 78.3ms

ActionView::Template::Error (undefined method `position' for nil:NilClass):
18:
19: <% if @grouped.empty? ><p class="nodata"><= l(:label_no_data) ></p>< end >
20:
21: < @grouped.keys.sort.each do |group| >
22: <h3><= group ></h3>
23: <= render :partial => 'documents/document', :collection => @grouped[group] >
24: < end %>
app/models/enumeration.rb:93:in `<=>'
app/views/documents/index.html.erb:21:in `sort'
app/views/documents/index.html.erb:21:in `_app_views_documents_index_html_erb__107423285_27756576'