How to define a checkbox variable in Cakephp

I have a form in my Plugin elements and what i would like to insert the checkbox value into a table named it_queries and field status_type and its giving me an error  Undefined variable: variableValue [APP\Plugin\Feedback\View\Elements\comment_add.ctp, line 37] .I have declared the variable in my controller like this

    $this->set('variableValueStatus', 'Pending');

and this is line 37 thats giving me the error

Below is the Controller code

    class CommentsController extends FeedbackAppController
    {
    public $components = array('Feedback.Comments');

    public function add($foreign_model = null, $foreign_id = null)
    {
    if (empty($foreign_model) ||
    empty($foreign_id) ||
    !$this->request->is('post')
    )
    {
            $this->set('variableValueStatus', 'Pending');
            return $this->redirect('/');
    }
    //Other code
       
    }

and in the add view in my element here is how i am trying to accessing the variable value

    echo $this->Form->checkbox('ItQuery.status_type', array('type' => 'hidden', 'value'=>$variableValueStatus));

If someone can show me how to fix this, that would be awesome

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