Archive entry has empty or unreadable filename

[heavyflames]

Steps to reproduce

1. Create package using the below methods.

public static void CreateTarGZ(string tgzFilename, string sourceDirectory)
{
    Stream outStream = File.Create(tgzFilename);
    var gzoStream = new GZipOutputStream(outStream);
    gzoStream.SetLevel(0);
    TarArchive tarArchive = TarArchive.CreateOutputTarArchive(gzoStream);

    // Note that the RootPath is currently case sensitive and must be forward slashes e.g. "c:/temp"
    // and must not end with a slash, otherwise cuts off first char of filename
    // This is scheduled for fix in next release
    tarArchive.RootPath = sourceDirectory.Replace("\\\\", "/");
    if (tarArchive.RootPath.EndsWith("/"))
        tarArchive.RootPath = tarArchive.RootPath.Remove(tarArchive.RootPath.Length - 1);

    AddDirectoryFilesToTar(tarArchive, sourceDirectory, true, true);

    tarArchive.Close();
}

private static void AddDirectoryFilesToTar(TarArchive tarArchive, string sourceDirectory, bool recurse, bool isRoot)
{
    // Optionally, write an entry for the directory itself.
    // Specify false for recursion here if we will add the directory's files individually.
    TarEntry tarEntry;

    if (!isRoot)
    {
        tarEntry = TarEntry.CreateEntryFromFile(sourceDirectory);
        tarArchive.WriteEntry(tarEntry, false);
    }

    // Write each file to the tar.
    string[] filenames = Directory.GetFiles(sourceDirectory);
    foreach (string filename in filenames)
    {
        if (!filename.EndsWith(".gz"))
        {
            Console.WriteLine($"Adding {filename}...");
            tarEntry = TarEntry.CreateEntryFromFile(filename);
            tarArchive.WriteEntry(tarEntry, true);
        }
        
    }
    if (recurse)
    {
        string[] directories = Directory.GetDirectories(sourceDirectory);
        foreach (string directory in directories)
            AddDirectoryFilesToTar(tarArchive, directory, recurse, false);
    }
}

2. Run windows tar.exe command from commandprompt : tar -xvf [nameOfTar].tar.gz

Expected behavior

The tar.exe should not report any errors.

Actual behavior

tar.exe returns this error : tar: Archive entry has empty or unreadable filename ... skipping.

Version of SharpZipLib

1.3.1