ActionController::RoutingError in Kategoris#show

Showing C:/Rails/konkurranceportalen/app/views/kategoris/_rating.html.erb where line #1 raised:

No route matches {:controller=>"konkurrancers", :action=>"rate", :id=>"51"}

Extracted source (around line #1):

1: <%= form_tag url_for(controller: 'konkurrancers',  action: 'rate', id: "#{vind.id}"), remote: true %>
2: <%= f.text_field :ratings, :size => 1, :min => 0, :max => 5, :step => 1 %>
3: <div class="rateit" data-rateit-backingfld="#item_ratings" data-rateit-resetable="true">
4: </div>