CSRF not working :(

gistfile1.txt

    $this->add(array(
      'name' => 'security',
      'type' => 'Zend\Form\Element\Csrf'
    ));
    
    $this->add(array(
      'name' => 'submit',
      'attributes' => array(
        'type'  => 'submit',
        'value' => 'Go',
        'id'    => 'submitbutton'
      )
    ));

    $this->setValidationGroup(array(
      'security',
      'option' => array(
        'name',
        'valuefield'
      )
    ));