Rails - Jul 2014 - Beginer Issue: NoMethodError in Posts#show

Hello, 

I'm new at Ruby on Rails, I'm using :
-Ubuntu 14.04 LTS
-Rails 4.1.2
-Ruby 2.1.2p95
-rvm 1.25.27

I'm actually following the rails guides : 
http://guides.rubyonrails.org/v4.0.6/getting_started.html#getting-up-and-running
Everything was going well until the point : 5.7 Showing points.
I have checked my files several times and I can't figure out where is my 
mistake, I can submit a post and then there is no display I get the error : 

 NoMethodError in Posts#show 

Showing */home/jeremy/projet/blog/app/views/posts/show.html.erb* where line 
*#3* raised: 

undefined method `title' for nil:NilClass

 Extracted source (around line *#3*):
 
123456
          
   <p>
    <strong>Title:</strong>
    <%= @post.title %>
  </p>
     <p>

Following you'll find my files :
-config/routes.rb
Rails.application.routes.draw do
  get 'welcome/index'

  # The priority is based upon order of creation: first created -> highest 
priority.
  # See how all your routes lay out with "rake routes".
  resources :posts
  # You can have the root of your site routed with "root"
  root 'welcome#index'

  # Example of regular route:
  #   get 'products/:id' => 'catalog#view'

  # Example of named route that can be invoked with purchase_url(id: 
product.id)
  #   get 'products/:id/purchase' => 'catalog#purchase', as:
:purchase

  # Example resource route (maps HTTP verbs to controller actions 
automatically):
  #   resources :products

  # Example resource route with options:
  #   resources :products do
  #     member do
  #       get 'short'
  #       post 'toggle'
  #     end
  #
  #     collection do
  #       get 'sold'
  #     end
  #   end

  # Example resource route with sub-resources:
  #   resources :products do
  #     resources :comments, :sales
  #     resource :seller
  #   end

  # Example resource route with more complex sub-resources:
  #   resources :products do
  #     resources :comments
  #     resources :sales do
  #       get 'recent', on: :collection
  #     end
  #   end

  # Example resource route with concerns:
  #   concern :toggleable do
  #     post 'toggle'
  #   end
  #   resources :posts, concerns: :toggleable
  #   resources :photos, concerns: :toggleable

  # Example resource route within a namespace:
  #   namespace :admin do
  #     # Directs /admin/products/* to Admin::ProductsController
  #     # (app/controllers/admin/products_controller.rb)
  #     resources :products
  #   end
end
-app/controllers/posts_controller.rb
class PostsController < ApplicationController
    def new
    end

    def create 
      @post = Post.new(post_params)

        @post.save
        redirect_to @post
    end

    private
        def post_params
            params.require(:post).permit(:title, :text)
        end

    def show
      @post = Post.find(params[:id])
    end
end
-app/views/posts/new.html.erb
<h1>New Post</h1>
<%= form_for :post, url: posts_path do |f| %>
  <p>
    <%= f.label :title %><br>
    <%= f.text_field :title %>
  </p>
 
  <p>
    <%= f.label :text %><br>
    <%= f.text_area :text %>
  </p>
 
  <p>
    <%= f.submit %>
  </p>
<% end %>
-db/migrate/20140630133544_create_posts.rb
class CreatePosts < ActiveRecord::Migration
  def change
    create_table :posts do |t|
      t.string :title
      t.text :text

      t.timestamps
    end
  end
end
-app/views/posts/show.html.erb
<p>
  <strong>Title:</strong>
  <%= @post.title %>
</p>
 
<p>
  <strong>Text:</strong>
  <%= @post.text %>
</p>

So if you can tell me what's wrong I'll be very happy, because I really 
don't get it. 
Thanks.




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