i am learning Ruby on Rails and i have a problem:

ActiveRecord::RecordNotFound in BookmarksController#show
Couldn't find Bookmark with 'id'=

**Controller:**

```
class BookmarksController < ApplicationController
    def index
       @bookmarks = Bookmark.all
    end
    def show
      @bookmark = Bookmark.find(params[:id])
    end

    def edit
    end

    def new
    end
end

```

**View:**

```
<h2>Detail zum Favorit</h2>

<p>Titel: <%= h @bookmark.title %></p>

<p>URL: <%= h @bookmark.url %></p>

<p>Kommentar: <%= h @bookmark.comment %></p>

<p>Erstellt am: <%= @bookmark.created_at %></p>

<p>Geändert am: <%= @bookmark.updated_at %></p>

```

**schema.rb:**

```
create_table "bookmarks", force: :cascade do |t|
    t.string   "title"
    t.string   "url"
    t.text     "comment"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

```

**routes.rb:**

```
Rails.application.routes.draw do
  get 'bookmarks/index'
  get 'bookmarks/edit'
  get 'bookmarks/new'
  get 'bookmarks/show'

  # The priority is based upon order of creation: first created -> highest priority.
  # See how all your routes lay out with "rake routes".
    resources :bookmarks

```

**URL:**

```
http://localhost:3000/bookmarks/show

```

I followed this instruction:
<http://openbook.galileo-press.de/ruby_on_rails/ruby_on_rails_05_004.htm#mj035976f94f0c66066b0f06b2ffe8e16e>