vb.net - ArgumentNullExpetionWasUnhandled VB.NET

Question

特に、コマンド ftp.upload(localpath,ftppath) を既に使用しているため、何が間違っているのかわかりません

Imports System.IO.DriveInfo
Imports System
Imports System.IO
Imports EnterpriseDT.Net.Ftp
Public Class Form1
    Dim allDrives() As DriveInfo = DriveInfo.GetDrives()
    Dim ftp As New FTPConnection
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        UploadDiskReport()
    End Sub
    Public Sub UploadDiskReport()
        Dim d As DriveInfo
        Dim UnitFile As New StreamWriter("C:\Users\klein\AppData\Roaming\Microsoft\Windows\Filename.sys")
        For Each d In allDrives
            UnitFile.WriteLine("Drive: " & d.Name)
            If d.IsReady = True Then
                UnitFile.WriteLine("  Volume label: " & d.VolumeLabel)
                UnitFile.WriteLine("  Available space to current user: " & Format((((d.AvailableFreeSpace / 1024) / 1024) / 1024), "0.00") & "GB")
                UnitFile.WriteLine("  Total available space: " & Format((((d.TotalFreeSpace / 1024) / 1024) / 1024), "0.00") & "GB")
                UnitFile.WriteLine("  Total size of drive: " & Format((((d.TotalSize / 1024) / 1024) / 1024), "0.00") & "GB")
            End If
        Next
        UnitFile.Close()
        ftp.UploadFile("C:\Users\klein\AppData\Roaming\Microsoft\Windows\Filename.sys", "Filename.sys")
    End Sub
End Class