Exception from HRESULT: 0x80072ee3 - backgrounddownloader winrt

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WinRT

FTP

I am getting below error when trying to download a file from ftp.
System.Exception was caught HResult=-2147012893 Message=Exception from HRESULT: 0x80072EE3 Source=mscorlib StackTrace: at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()


can anyone tell me what am I doing wrong ?
Thanks in advance!

What I have tried:

Below is the code I am using-

public static async Task<bool> LargeDownLoad(string localsubfolders, string ftpURIInfo, string Username, string Password, string filename)
    {
        bool Successful = false;
        try
        {
            StorageFolder localFolderArea;
            BackgroundDownloader downloader = new BackgroundDownloader();
            // Open if exists as you cannot delete it if there are files in it.
            localFolderArea = await Windows.Storage.ApplicationData.Current.LocalFolder.CreateFolderAsync(localsubfolders, CreationCollisionOption.OpenIfExists);

            // create a storagefile which combines the localFolderArea with the filename of the local file.
            StorageFile localFilePath = await localFolderArea.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting);

            Uri urlWithCredential; // = new Uri(ftpURIInfo + "/" + filename);
            bool Success = Uri.TryCreate(ftpURIInfo + "/" + filename, UriKind.Absolute, out urlWithCredential);

            if (!string.IsNullOrEmpty(Username.Trim()) &&
               !string.IsNullOrEmpty(Password.Trim()))
            {
                urlWithCredential = new Uri(urlWithCredential.ToString().ToLower().Replace(@"ftp://",
                    string.Format(@"ftp://{0}:{1}@",
                    Username,
                    Password)));
            }

            DownloadOperation download = downloader.CreateDownload(
                urlWithCredential,
                localFilePath);
            await download.StartAsync();

            Successful = true;

        }
        catch (Exception)
        {
            throw;
        }
        return Successful;
    }