Ruby-on-rails – Problems with “devise_for”, “devise_scope”!

I'm trying to customize my routes in devise. I've tried to use devise_scope :user, but it dind't work. So I changed to devise_for, and skiped the custom routes (registrations, confirmations, passwords, session) and it worked. But then, an error show up in my views, when i wass calling "session_path" for example. It was making a form redirecting to "session.user", that makes no sense.

Here is the code:

  #routes.rb

  devise_for :users, :path => '', :skip => [ :passwords, :registrations, :confirmations] do
    post   "account/password",      :to => "devise/passwords#create"
    get    "account/password/new",  :to => "devise/passwords#new", :as => "new_password"
    get    "account/password/edit", :to => "devise/passwords#edit", :as => "edit_password"
    put    "account/password",      :to => "devise/passwords#update"
    post   "account",               :to => "users/registrations#create"
    get    "sign_up",               :to => "users/registrations#new"
    delete "account",               :to => "users/registrations#destroy"
    post   "confirmation",          :to => "devise/confirmations#create"
    get    "confirmation/new",      :to => "devise/confirmations#new", :as => "new_confirmation"
    get    "confirmation",          :to => "devise/confirmations#show"
  end

New session view:

  #users/sessions/new.html.erb
  = form_for(resource, :as => resource_name, :url => session_path(resource_name)) do |f| %>

Error:

No route matches {:action=>"new", :format=>:user, :controller=>"devise/passwords"}

What do I do? What happened to "devise_scope" doesn't work correctly (The error it was showing up was "Could not find devise mapping for …")?

Thanks