Error Retrieving File

We are uploading files as follows (VB.NET):

Dim uploader As New UploadHelper(api)
Dim id As ObjectId
id = uploader.CreateObject(fStream, New Acl(), New MetadataList(), False)

When that runs, the var id contains an object ID.

But when I try to retrieve the file, I get an error.

My code:

            Dim buff() As Byte
            Dim downLoad As New DownloadHelper(Me.api, buff)

            Dim AtmosObject As New ObjectId(Me.txtObjectKey.Text)
            downLoad.ReadObject(AtmosObject, Me.SaveFileDialog1.FileName)

The error is System.IndexOutOfRangeException

{"Index was outside the bounds of the array."}

It is thrown by ReadObject.

Stack trace:

   at EsuApiLib.Rest.EsuRestApi.readMetadata(MetadataList meta, String header, Boolean listable)
   at EsuApiLib.Rest.EsuRestApi.GetSystemMetadata(Identifier id, MetadataTags tags)
   at EsuApiLib.DownloadHelper.ReadObject(ObjectId id, Stream stream, Boolean closeStream)
   at EsuApiLib.DownloadHelper.ReadObject(ObjectId id, String file)
   at AtmosTest.Form1.LinkLabel3_LinkClicked(Object sender, LinkLabelLinkClickedEventArgs e) in C:\Development\Atmos Tester\Form1.vb:line 53
   at System.Windows.Forms.LinkLabel.OnLinkClicked(LinkLabelLinkClickedEventArgs e)
   at System.Windows.Forms.LinkLabel.OnMouseUp(MouseEventArgs e)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.Label.WndProc(Message& m)
   at System.Windows.Forms.LinkLabel.WndProc(Message& msg)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run(ApplicationContext context)
   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
   at AtmosTest.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
   at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

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I don't REALLY know if the file was uploaded successfully.