ruby on rails 4 - ActionController::UrlGenerationError in Devise::Sessions#new -

i use nav bar (using devise on rails; included in dashboard.html.erb) works fine when logged in; when wanting use in pages , including in application.html.erb, error: actioncontroller::urlgenerationerror in devise::sessions#new

additional info: "no route matches {:action=>"index", :controller=>"devise/users"}"

this route.rb:

  rails.application.routes.draw   root 'dashboard#index'   devise_for :users   resources :users 

how should implement in rails following dry? (am new rails)

this navigation bar:

<nav class="navbar navbar-default navbar-fixed-top"> <div class="container">     <div class="navbar-header">     <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target=".navbar-collapse">     <span class="sr-only">toggle navigation</span>     <span class="icon-bar"></span>     <span class="icon-bar"></span>     <span class="icon-bar"></span>     </button>     <a class="navbar-brand"><%= rails.application.class.parent_name %></a>     </div> <div class="navbar-collapse collapse">     <ul class="nav navbar-nav">         <li><%= link_to 'dashboard', root_path %></li>         <li><%= link_to 'users', controller: 'users' %></li>         <li><a href="#contact">contact</a></li>         <li class="dropdown">             <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">dropdown <span class="caret"></span></a>         <ul class="dropdown-menu">             <li><p> logged in <%= current_user.email %></p></li>             <li><a href="#">another action</a></li>             <li><a href="#">something else here</a></li>             <li role="separator" class="divider"></li>             <li class="dropdown-header">nav header</li>             <li><a href="#">separated link</a></li>             <li><a href="#">one more separated link</a></li>         </ul>         </li>         </ul>     <ul class="nav navbar-nav navbar-right">         <li><%= link_to "log out", destroy_user_session_path, method: :delete %></li>         <li><%= link_to edit_user_registration_path %><strong><%= current_user.first_name %></strong><% end %></li>     </ul> </div><!--/.nav-collapse --> </div> 

i assume you're using wrong arguments link_to helper here:

<li><%= link_to 'users', controller: 'users' %></li> 

try one:

<li><%= link_to 'users', users_path %></li> 

or, if point actual controller:

<li><%= link_to 'users', controller: 'users', action: 'index' %></li> 

more info link_to available here

hope helps.

update

yes, sure, can next:

<% if user_signed_in? %>     <ul class="nav navbar-nav">         <li><%= link_to 'dashboard', root_path %></li>         <li><%= link_to 'users', controller: 'users' %></li>         <li><a href="#contact">contact</a></li>         <li class="dropdown">             <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">dropdown <span class="caret"></span></a>             <ul class="dropdown-menu">                 <li><p> logged in <%= current_user.email %></p></li>                 <li><a href="#">another action</a></li>                 <li><a href="#">something else here</a></li>                 <li role="separator" class="divider"></li>                 <li class="dropdown-header">nav header</li>                 <li><a href="#">separated link</a></li>                 <li><a href="#">one more separated link</a></li>             </ul>         </li>     </ul> <% else %>     # somethid else <% end %>