[Débutant] Erreur à la fermeture d'un serveur

Bonjour tout le monde,

comme l'indique le titre, je rencontre un problème avec la fermeture de mon formulaire serveur socket, il m'indique un message d'erreur que je n'ai pas compris :? (Impossible d'appeler la valeur Dispose() pendant un CreateHandle().) je ne vois pas de quoi pourrait bien provenir cette erreur, voici le code coté serveur :
Code:
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Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 
        CheckForIllegalCrossThreadCalls = False
        Serveur = New TcpListener(IPAddress.Any, 80)
        Serveur.Start()
        ThreadServeur = New Thread(AddressOf Listening)
        ThreadServeur.Start()
        ListBox1.Items.Add("Serveur lancé et en attente de connexion...")
 
    End Sub
 
    Public Sub Listening()
        Dim Client As New NClient
        While True
            Try
 
                    Client.SocketClient = Serveur.AcceptSocket
                    ClientIP = Client.SocketClient.RemoteEndPoint
                    Client.ThreadClient = New Thread(AddressOf Lecture)
                    Clients.Add(ClientIP, Client)
                    NConnexion(ClientIP)
                    Client.ThreadClient.Start()
 
            Catch ex As Exception
            End Try
        End While
 
    End Sub
 
    Public Sub Lecture()
 
        Dim Client As New NClient
        Dim DATAS() As Byte
        Dim IP As IPEndPoint = ClientIP
        Client = Clients(IP)
        While True
            If Client.SocketClient.Connected Then
                DATAS = New Byte(100) {}
                Try
                    If Client.SocketClient.Receive(DATAS, DATAS.Length, 0) > 0 Then
                        Client.Message = Encoding.UTF7.GetString(DATAS)
                        Clients(IP) = Client
                        Data_Recue(IP)
                    Else
                        ConnexionFinie(IP)
                        Exit While
                    End If
                Catch ex As Exception
                    ConnexionFinie(IP)
                    Exit While
                End Try
            End If
 
        End While
        Call Fermer_Le_Thread(IP)
    End Sub
 
    Public Sub Fermer_Le_Thread(ByVal IP As IPEndPoint)
        Dim Client As NClient = Clients(IP)
        Try
            Client.ThreadClient.Abort()
        Catch ex As Exception
            Clients.Remove(IP)
        End Try
 
    End Sub
 
    Private Sub NConnexion(ByVal IDTerminal As IPEndPoint)
 
        ListBox1.Items.Add(vbCrLf & "Connexion de " & "Client1...")
        RichTextBox1.ScrollToCaret()
        ListBox1.Items.Add("Client1 en ligne !")
        SendAll("Connecté !")
 
    End Sub
 
    Private Sub ConnexionFinie(ByVal IDTerminal As IPEndPoint)
 
        Try
            ListBox1.Items.Add(vbCrLf & "Déconnexion de " & "Client1...")
            RichTextBox1.ScrollToCaret()
            ListBox1.Items.Remove("Client1 en ligne !")
            SendAll("Déconnecté !")
        Catch ex As Exception
        End Try
 
    End Sub
 
    Private Sub Data_Recue(ByVal IDTerminal As IPEndPoint)
 
        RichTextBox1.AppendText(vbCrLf & "Client1" & " : ")
        RichTextBox1.AppendText(Data_Obtenue(IDTerminal))
        RichTextBox1.ScrollToCaret()
        SendAll("Client1" & " : " & Data_Obtenue(IDTerminal))
 
    End Sub
 
    Public Function Data_Obtenue(ByVal IDClient As IPEndPoint) As String
        Dim Client As NClient
        Client = Clients(IDClient)
        Return Client.Message
 
    End Function
 
    Public Sub CreateOne(ByVal IDClient As IPEndPoint)
 
        Dim Client As NClient
        Client = Clients(IDClient)
        Client.SocketClient.Close()
        Client.ThreadClient.Abort()
 
    End Sub
 
    Public Sub CreateAll()
 
        Dim Client As NClient
        For Each Client In Clients.Values
 
            Client.SocketClient.Close()
            Client.ThreadClient.Abort()
        Next
 
    End Sub
 
    Public Sub SendOne(ByVal IDClient As IPEndPoint, ByVal DATAS As String)
 
        Dim Client As NClient
        Client = Clients(IDClient)
        Client.SocketClient.Send(Encoding.UTF7.GetBytes(DATAS))
 
    End Sub
 
    Public Sub SendAll(ByVal DATAS As String)
 
        Dim Client As NClient
        For Each Client In Clients.Values
            Client.SocketClient.Send(Encoding.UTF7.GetBytes(DATAS))
        Next
 
    End Sub
 
 
 
    Private Sub TextBox2_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox2.KeyDown
 
        If e.KeyCode = Keys.Enter Then
 
            SendAll("Serveur : " & TextBox2.Text)
            RichTextBox1.AppendText(vbCrLf & "Serveur : " & TextBox2.Text)
            RichTextBox1.ScrollToCaret()
            TextBox2.Clear()
 
        End If
 
    End Sub
 
    Private Sub Form1_FormClosed(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosedEventArgs) Handles Me.FormClosed
 
        SendAll("Serveur déconnecté !")
        CreateAll()
        Serveur.Stop()
        ThreadServeur.Abort()
 
 
    End Sub
 
End Class
Merci pour votre aide ! :P