How do I fix this Message="OpenCV: The node does not represent a user object (unknown type?)"

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VB

Emgu-CV

Hi,

I'm doing something with vb net 2005 and emgu cv 2.9.0.1922. I want some help.
I have an error i can't understand since days :( :( :( :( :( and it's on this line

Dim haar As HaarCascade = New HaarCascade(".\haarcascade_frontalface_alt_tree.xml")

____________________________

the code is the following

Private Sub ProcessFame(ByVal sender As Object, ByVal arg As EventArgs)
' Get frames from camera
Dim ImageFrame As Image(Of Emgu.CV.Structure.Bgr, Byte) = capturee.QueryFrame()

Dim haar As HaarCascade = New HaarCascade(".\haarcascade_frontalface_alt_tree.xml")

If Not (ImageFrame Is Nothing) Then
' Convert image to gray scale
Dim grayFrame As Image(Of Emgu.CV.Structure.Gray, Byte) = ImageFrame.Convert(Of Emgu.CV.Structure.Gray, Byte)()

' Detect faces form the gray-scale image and store into an array
Dim faces = grayFrame.DetectHaarCascade(haar, 1.4, 4, CvEnum.HAAR_DETECTION_TYPE.DO_CANNY_PRUNING, New Size(20, 20))

'' Draw a green rectangle on each detected face in image
For Each face As MCvAvgComp In faces
ImageFrame.Draw(face.rect, New Bgr(Color.Green), 3)
Next

' Number of faces detected
Me.Label1.Text = "Total faces detected : " & faces.Length

End If


'Show pictures into CamImageBox
CamImageBox.Image = ImageFrame

'Show pictures into pic_prise
pic_prise.Image = ImageFrame.ToBitmap()

'End Sub
________________________________________________

the error is the following

L'exception Emgu.CV.Util.CvException n'a pas été gérée
ErrorStr="Unspecified error"
Message="OpenCV: The node does not represent a user object (unknown type?)"
Source="Emgu.CV"
StackTrace:
à Emgu.CV.CvInvoke.CvErrorHandler(Int32 status, String funcName, String errMsg, String fileName, Int32 line, IntPtr userData)
à Emgu.CV.CvInvoke._cvLoad(String fileName, IntPtr memstorage, String name, IntPtr realName)
à Emgu.CV.CvInvoke.cvLoad(String fileName, IntPtr memstorage, String name, IntPtr realName)
à Emgu.CV.HaarCascade..ctor(String fileName)
à WindowsApplication1.CameraCapture.ProcessFame(Object sender, EventArgs arg)
à System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32 grfidlef)
à System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
à System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
à System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
à System.Windows.Forms.Application.Run(ApplicationContext context)
à Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
à Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
à Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
à WindowsApplication1.My.MyApplication.Main(String[] Args)
à System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
à System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
à Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
à System.Threading.ThreadHelper.ThreadStart_Context(Object state)
à System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
à System.Threading.ThreadHelper.ThreadStart()


Thank you for your help.