INSERT dans une DB SQL SERVER 2008

Bonjour à tous(tes),
J'essaie en vain de faire un INSERT en ASP dans ma DB SQL Server via un formulaire.
Bien qu'il me semble que mon codage soit correct, je reçoit invariablement un message du type:

Citation:

Microsoft OLE DB Provider for SQL Server erreur '80040e14'

The parameterized query '(@P1 char(50),@P2 char(50),@P3 char(35),@P4 char(10),@P5 char(25' expects the parameter '@P8', which was not supplied.

Le lien de mon formulaire: http://www.kiffarts.be/pages/inscVisiteur.asp

Le code ASP de mon INSERT:

Code:

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<%
Dim MM_editAction
MM_editAction = CStr(Request.ServerVariables("SCRIPT_NAME"))
If (Request.QueryString <> "") Then
  MM_editAction = MM_editAction & "?" & Server.HTMLEncode(Request.QueryString)
End If
 
' boolean to abort record edit
Dim MM_abortEdit
MM_abortEdit = false
%>
<%
' IIf implementation
Function MM_IIf(condition, ifTrue, ifFalse)
  If condition = "" Then
    MM_IIf = ifFalse
  Else
    MM_IIf = ifTrue
  End If
End Function
%>
<%
If (CStr(Request("MM_insert")) = "IntroVis") Then
  If (Not MM_abortEdit) Then
    ' execute the insert
    Dim MM_editCmd
 
    Set MM_editCmd = Server.CreateObject ("ADODB.Command")
    MM_editCmd.ActiveConnection = MM_kifdb_STRING
    MM_editCmd.CommandText = "INSERT INTO dbo.Membres (Nom, Prenom, Pseudo, Sexe, Pwd, Email, Avatar, NewsLetter) VALUES (?, ?, ?, ?, ?, ?, ?, ?)" 
    MM_editCmd.Prepared = true
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("@P1", 129, 1, 50, Request.Form("Nom")) 
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("@P2", 129, 1, 50, Request.Form("Prenom")) 
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("@P3", 129, 1, 35, Request.Form("Pseudo")) 
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("@P4", 129, 1, 10, Request.Form("Sexe")) 
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("@P5", 129, 1, 25, Request.Form("Pwd"))
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("@P6", 129, 1, 50, Request.Form("Email")) 
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("@P7", 129, 1, 50, Request.Form("Avatar")) 
    MM_editCmd.Parameters.Append MM_editCmd.CreateParameter("@P8", 129, 1, 3, Request.Form("NewsLetter")) 
    MM_editCmd.Execute
    MM_editCmd.ActiveConnection.Close
 
    ' append the query string to the redirect URL
    Dim MM_editRedirectUrl
    MM_editRedirectUrl = "EnregReussi.asp"
    If (Request.QueryString <> "") Then
      If (InStr(1, MM_editRedirectUrl, "?", vbTextCompare) = 0) Then
        MM_editRedirectUrl = MM_editRedirectUrl & "?" & Request.QueryString
      Else
        MM_editRedirectUrl = MM_editRedirectUrl & "&" & Request.QueryString
      End If
    End If
    Response.Redirect(MM_editRedirectUrl)
  End If
End If
%>

Je tourne en rond, si quelqu'un pouvais me donner une piste, ce serais sympa
D'avance merci