phpseclib\Net\SFTP::getSFTPErrors PHP Method

    function getSFTPErrors()
    {
        return $this->sftp_errors;
    }

 /**
  * {@inheritdoc}
  */
 public function download($local, $remote)
 {
     $this->checkConnection();
     if (!$this->sftp->get($remote, $local)) {
         throw new \RuntimeException(implode($this->sftp->getSFTPErrors(), "\n"));
     }
 }