I have never understood these messages so i am attempting to work it out.

Does the below message say that a paremeter in the module LogFile has a zero length?
On my pc clsStream.Write(bFile, 0, bFile.Length) holds values but on 2 w10 pc's this has caused errors.

Code:
************** Exception Text **************
System.ArgumentOutOfRangeException: Length cannot be less than zero.
Parameter name: length
   at System.String.InternalSubStringWithChecks(Int32 startIndex, Int32 length, Boolean fAlwaysCopy)
   at System.String.Substring(Int32 startIndex, Int32 length)
   at TakeoffExpress.LogFile.gGetInfo()
   at TakeoffExpress.Form1.Form1_Load(Object sender, EventArgs e)
   at System.EventHandler.Invoke(Object sender, EventArgs e)
   at System.Windows.Forms.Form.OnLoad(EventArgs e)
   at System.Windows.Forms.Form.OnCreateControl()
   at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible)
   at System.Windows.Forms.Control.CreateControl()
   at System.Windows.Forms.Control.WmShowWindow(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.ContainerControl.WndProc(Message& m)
   at System.Windows.Forms.Form.WmShowWindow(Message& m)
   at System.Windows.Forms.Form.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Code:
Module LogFile

   Public Sub uUpLoadLogFile()

        'deleted code here to save your eyes

          clsRequest.Method = System.Net.WebRequestMethods.Ftp.AppendFile
            'read into existing log.txt file...
            Dim bFile() As Byte = System.IO.File.ReadAllBytes(My.Computer.FileSystem.SpecialDirectories.MyDocuments & "/TakeoffExpress/Log/Log.txt")
            ' upload file...
            Dim clsStream As System.IO.Stream = clsRequest.GetRequestStream()
            clsStream.Write(bFile, 0, bFile.Length)
            clsStream.Close()
            clsStream.Dispose()

      'deleted code here to save your eyes
  End Sub