function formAsk()
   {
      return new Form($this, 'formAskAction', new FieldSet(
         // List your fields here
         new HiddenField (
          'ProductName',
          'Product Name',
          $this->Title
         ),
         new HiddenField (
          'ProductId',
          'Product Id',
          $this->InternalProductId
         ),
         new LiteralField (
            'Explanation',
            '<p><b>Ask us a question about this product</b></p>
            <p>Please select the type of question you would like to ask and fill in the boxes below.</p>'
         ),
         new OptionsetField(
            'Who',
            'What type of question is this?',
            array(
               self::FORM_WHO_SALES => 'Sales',
               self::FORM_WHO_TECH => 'Technical Support'
            )
         ),
         new TextField('FirstName', 'First name'),
         new TextField('Surname'),
         new EmailField('Email'),
         new PhoneNumberField('Telephone', 'Telephone', 0),
         new TextareaField('Enquiry')
      ), new FieldSet(
         // List the action buttons here
         new FormAction('formAskAction', 'Submit')
      ), new RequiredFields(
         'Who', 'FirstName', 'Surname', 'Email', 'Enquiry'
      ));
   }

   function formAskAction($data, $form)
   {
      //Director::redirect($this->Link() . 'formAskDone?referrer=' . urlencode($data['Referrer']));
      $data = array('formAsk' => 'Thank you for your email! '.$this->form_who[intval($form->Who)]);
      return $this->customise($data);
   }

[Warning] Missing argument 2 for Product_Controller::formAskAction(), called in /var/www/sapphire/core/control/Controller.php on line 162 and defined
POST /new-product/formAskAction