mapdev\FacebookMessenger\Exceptions\CouldNotCreateMessage::noStickerDefined PHP Метод

    public static function noStickerDefined()
    {
        return new static('You must define an Sticker');
    }

 public function toArray()
 {
     $this->checkRecipient();
     if (is_null($this->sticker)) {
         throw CouldNotCreateMessage::noStickerDefined();
     }
     return ['recipient' => ['id' => $this->recipient_id], 'sticker_id' => $this->sticker];
 }