cant get autocomplete function to find helper class

In CakePHP, I am trying to create a autocomplete function from a textbox, using this tutorial: http://bakery.cakephp.org/articles/matt_1/2011/08/07/yet_another_jquery_autocomplete_helper_2

I keep getting a Error: AutoCompleteHelper could not be found. Undefined index: autoCompleteText

I am unsure how to fix this as I have tried relocating the files and still the same error.

I create the below files and copy the code from the tutorial, create the auto_complete.php in the view/helpers directory, and create webroot/js/views/helpers/auto_complete.js.

controller - Tests function auto_complete

class TestsController extends AppController {

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

 public function auto_complete() {
 $this->loadModel('Tutor');
 debug( $this->params);


    $terms = $this->Tutor->find('all', array(
        'conditions' => array(
            'Tutor.first_name LIKE' => $this->params['url']['autoCompleteText'].'%'
        ),
        'fields' => array('Tutor.first_name'),
        'limit' => 3,
        'recursive'=>-1,
    ));
    $terms = Set::Extract($terms,'{n}.Tutor.first_name');
    $this->set('terms', $terms);
    $this->layout = '';    
} 

view
 auto_complete.ctp

<?php
echo $this->AutoComplete->input(
    'Ttuor.first_name',
    array(
        'autoCompleteUrl'=>$this->Html->url(
            array(
                'controller'=>'tests',
                'action'=>'auto_complete',
            )
        ),
        'autoCompleteRequestItem'=>'autoCompleteText',
    )
);

  if(isset($terms)) {
    echo $this->Js->object($terms);
  }

       echo $this->Form->create('');

            echo $this->Form->input('type', array('label' => 'Choose' ));
           echo $this->Form->end('send');

 ?>

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