Devise: Links don't work - ruby-on-rails

Question

for my web app I'm using devise for the user authentication. Alas the app
doesn't return the sign in(or sign up) page, when I click on the links, but
the root page. Maybe somebody can help? Thanks!
routes.rb:
root to: 'static#home'
devise_for :users
devise_for :user, :path => '', :path_names => { :sign_in => "login", :sign_out => "logout", :sign_up => "register" }
_header.html.erb:
<header class="navbar navbar-fixed-top">
<div class="navbar-inner">
<div class="container">
<%= link_to "Kung Pao", '#', id: "logo" %>
<nav>
<ul class="nav pull-right">
<li><%= link_to "Start", root_path %></li>
<li><%= link_to "Login", new_user_session_path %></li>
<li><%= link_to "Registrierung", new_user_registration_path %></li>
</ul>
</nav>
</div>
</div>
</header>
rake routes:
root / static#home
new_user_session GET /login(.:format) devise/sessions#new
user_session POST /login(.:format) devise/sessions#create
destroy_user_session DELETE /logout(.:format) devise/sessions#destroy
user_password POST /password(.:format) devise/passwords#create
new_user_password GET /password/new(.:format) devise/passwords#new
edit_user_password GET /password/edit(.:format) devise/passwords#edit
PUT /password(.:format) devise/passwords#update
cancel_user_registration GET /cancel(.:format) devise/registrations#cancel
user_registration POST / devise/registrations#create
`enter code here` new_user_registration GET /register(.:format) devise/registrations#new
edit_user_registration GET /edit(.:format) devise/registrations#edit
PUT / devise/registrations#update
DELETE / devise/registrations#destroy

Answer 1

Change your config/routes.rb to be:
root to: 'static#home'
devise_for :users, :path => '', :path_names => { :sign_in => "login", :sign_out => "logout", :sign_up => "register" }
resources :users
You're setting path names for "user" but devise is looking for the pluralized resource name, which you define with no path.