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Unknown Directory Type when downloading file from server

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Unknown Directory Type when downloading file from server

class Get extends \Magento\Framework\App\Action\Action
..... 
   public function execute()
    {
        $fileName = $this->getRequest()->getParam('file');
        chdir(BP);
        chdir('../download');
        $file = getcwd() . "//$fileName";
        $this->_logger->info('Downloading..: ' . $file);

        $dlName = explode('\\', $file);
        $_dl = end($dlName);
        $fileName = $_dl;
        $this->_logger->info($_dl);
        if (file_exists($file)) {           
 return $this->_downloader->create(
                $fileName, 
                @file_get_contents($file),
                $mediapath.'download',
                'application/octet-stream'//content type
                );
}
}

Im getting this error:

Exception #0 (Magento\Framework\Exception\FileSystemException): Unknown directory type: 'C:/xampp/htdocs/pneumatig-magento2/pub/media/download'

How do I fix that?