[SQL server et VBA] remplir une combobox depuis un recordset

Bonjour,
j'ai une base de données sql server et un userform. Je veux remplir mes combobox. Mais j'ai une erreur "Erreur d'execution : le type ne correspond pas"

En vous remerciant

Code:

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Private Sub UserForm_Initialize()
    On Error GoTo UserForm_Initialize_Err
    Dim cnn As New ADODB.Connection
    Dim rst As New ADODB.Recordset
    cnn.Open "Provider=Microsoft.Jet.OLEDB.4.0;" & _
             "Data Source=C:\Databases\StaffDatabase.mdb"
    rst.Open "SELECT DISTINCT [Department] FROM tblStaff ORDER BY [Department];", _
             cnn, adOpenStatic
    rst.MoveFirst
    With Me.ComboBox1
        .Clear
        Do
            .AddItem rst![Department]
            rst.MoveNext
        Loop Until rst.EOF
    End With
UserForm_Initialize_Exit:
    On Error Resume Next
    rst.Close
    cnn.Close
    Set rst = Nothing
    Set cnn = Nothing
    Exit Sub
UserForm_Initialize_Err:
    MsgBox Err.Number & vbCrLf & Err.Description, vbCritical, "Error!"
    Resume UserForm_Initialize_Exit
End Sub