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初學vb.net編程，請各位幫幫忙 vb.net報錯

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim iRet As Integer
        Dim szDeviceName As String = "d0"         'List data for 'DeviceName'
        Dim iNumberOfDeviceName As Integer = 2  'Data for 'DeviceSize'
        Dim sharrBufferForDeviceValue() As Integer
        DotUtlType1.ActLogicalStationNumber = CInt(1)
        'The Open method is executed.
        iRet = DotUtlType1.Open()

        iRet = DotUtlType1.ReadDeviceBlock(szDeviceName,
                                                           iNumberOfDeviceName,
                                                                           sharrBufferForDeviceValue(0))


    End Sub
End Class

是三菱的，請各位幫忙解答。。。謝謝大家。