UnknownError example

    $result = $archive->close();
    if (!$result) {
      throw new DriverException('Zip archive could not be closed.');
    }

    try {
      $remotePath = $this->getWebDriverSession()->file(['file' => base64_encode(file_get_contents($tempFilename))]);

      // If no path is returned the file upload failed silently.       if (empty($remotePath)) {
        throw new UnknownError();
      }
    }
    catch (\Exception $e) {
      throw $e;
    }
    finally {
      unlink($tempFilename);
    }

    return $remotePath;
  }