Routing Error No route matches {:action=>"show"
===

I only have 2 weeks learning ruby on rails, in my app the users can register their cars, from their profile (code below) the app sent to the registration cars page,
 
    <div class="container">
            <fieldset>
                <h1><%= @user.email %></h1>
                 <br> 
                 <h2>now you are able to...</h2>
                 <br>
                 <ul>
                    <li>
                        <strong>new car registration: </strong>
                        <%= link_to "new car", new_user_car_path(current_user)%>
                    </li>
                </ul>
            </fieldset>
        </div>


it works before but i don't know what i did that now it show this:

    Routing Error

    No route matches {:action=>"show", :user_id=>#<User id: 27, email: "armando.santoya@hotmail.com", encrypted_password: "$2a$10$EZtvPWiXgMfUlAqvuvGAzODMaas/y4rGkJPKJtg4PnC6...", reset_password_token: nil, reset_password_sent_at: nil, remember_created_at: nil, sign_in_count: 1, current_sign_in_at: "2012-07-24 19:07:54", last_sign_in_at: "2012-07-24 19:07:54", current_sign_in_ip: "127.0.0.1", last_sign_in_ip: "127.0.0.1", name: nil, created_at: "2012-07-24 19:07:54", updated_at: "2012-07-24 19:07:54">, :controller=>"cars"}

    Try running rake routes for more information on available routes.

also I put my carsController

    class CarsController < ApplicationController
      def new
        @car = Car.new
      end

      def create
        @car = current_user.Car.new(params[:car])
        if @car.save
          flash[:notice] = "new car created success"
          #redirect_to current_user, :flash => { :success => "car created!" }
        else
          #redirect_to new_user_car_path, 
          flash[:notice] = "sorry try again"
        end
      end

      def index
        @car=Car.all
      end

      def show
       @car = current_user.car.find(params[:id])
       #@car = Car.find(params[:id])
       #redirect_to @user
      end
    end

and my routes.rb
    
    Estaciones::Application.routes.draw do
    root :to => "static_pages#home"
    match '/contact', :to=>'static_pages#contact'
    match '/about', :to=>'static_pages#about'
    devise_for :users
    resources :users do
    resources :cars
    end
