Error linking forum titles to individual posts.

Greetings everyone here. I am combining one Andrew Perkin video tutorial (which explains cakephp in a step by step manner but quite stale) with the official cake forum example (more current but less explanatory) in learning cakePHP. The first thing I learnt how to do was to view all posts on the index page, which works very fine. Then I proceeded to using "id's" to view individual posts through the "view" action, this also works perfectly. My challenge started when I wanted to link titles on the index page to their individual forum posts. I do not seem to get the link class well. I tried Andrew Perkin's approach but I was showed errors. Then I updated his version to the official cake example style (adding helpers, exception for null id's, etc), but still I am being told that "

Fatal Error

Error: Cannot access empty property
File: C:\xampp\htdocs\cakephp\lib\Cake\View\View.php

Line: 867"         

The surprising thing about this error is that I have never edited the contents on the ../lib directory. So I do not know how to rectify it. I am only used to the ../app directory. 

Kindly find my code below and the associated file paths:

 MODEL 

cakephp/app/Model/Writeup.php

<?php

class Writeup extends AppModel {

var $name='Writeup';

}

?>

CONTROLLER

cakephp/app/Controller/WriteupsController.php

class WriteupsController extends AppController {

public $helpers = array('Html','Form');

public function index() {

$this->set('writeups',$this->Writeup->find('all'));

}

public function view($id = null) {

$this->set('writeup',$this->Writeup->findById($id));

}

public function hello_world() {

}

}

?>

VIEW

cakephp/app/Views/Writeups/index.ctp

<h2> View All Posts</h2>

<table>

   <tr>

        <th>Title</th>

        <th>Body</th>

   </tr>

<?php foreach ($writeups as $writeup): ?>

   <tr>

         <td><?php echo $this->$Html->link($writeup['Writeup']['title'],

 array('controller'=>'writeups', 'action'=>'view',$writeup['Writeup']['id']));?> </td>

         <td><?php echo $writeup['Writeup']['body'];?> </td>

   </tr>

<?php endforeach; ?>     

</table>

######################################################################

cakephp/app/Views/Writeups/view.ctp

<h2> <?php echo $writeup['Writeup']['title'];?></h2>

<p><?php echo $writeup['Writeup']['body'];?></p>

<p><small>Created on: <?php echo $writeup['Writeup']['created']; ?>

 Last modified on: <?php echo $writeup['Writeup']['modified']; ?></small></p>

#######################################

Once again, the error being provided by the debugger is that "Cannot access empty property" and the file path of the error is "C:\xampp\htdocs\cakephp\lib\Cake\View\View.php", a path that I have never edited. 

Thank you.

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