I dont understand extend view

The example : 

// app/View/Common/view.ctp

<h1><?php echo $this->fetch('title'); ?></h1>

<?php echo $this->fetch('content'); ?>

<div class="actions">

    <h3>Related actions</h3>

    <ul>

    <?php echo $this->fetch('sidebar'); ?>

    </ul>

</div>

// app/View/Posts/view.ctp

$this->extend('/Common/view');

$this->assign('title', $post);

$this->start('sidebar');

?>

<li>

<?php

echo $this->Html->link('edit', array(

    'action' => 'edit',

    $post['Post']['id']

)); ?>

</li>

<?php $this->end(); ?>

// The remaining content will be available as the 'content' block

// in the parent view.

<?php echo h($post['Post']['body']);

Didn't work ?? I get : 

Error: The view for PostsController::view() was not found.

Error: Confirm you have created the file: C:\wamp\www\cakephp-2.2.4\app\View\Common\view.ctp

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