StackOverflowException

when i invoke the  code below i get An unhandled exception of type 'System.StackOverflowException' occurred in mscorlib.dllerror what might be wrong? some one help <code>

  <WebMethod()> _
    Public Function Receive_VerifyPinNo(ByVal transpin As String, ByVal userid As String, ByVal sectoken As String) As String
        'web method to verify pin
        'code to cal the service
        Dim service As New ERSAL.ERSAL
        Dim b As String = Receive_VerifyPinNo(transpin, userid, sectoken)
        'msgbox(b)
        Return b


        'returning the values passed

    End Function

</code>

<error>

  <Global.System.Configuration.ApplicationScopedSettingAttribute(),  _
         Global.System.Diagnostics.DebuggerNonUserCodeAttribute(),  _
         Global.System.Configuration.SpecialSettingAttribute(Global.System.Configuration.SpecialSetting.WebServiceUrl),  _
         Global.System.Configuration.DefaultSettingValueAttribute("http://195.229.125.174:102/Ersal.asmx")>  _
        Public ReadOnly Property ImpalaToErsal_ERSAL_ERSAL() As String
            Get
                Return CType(Me("ImpalaToErsal_ERSAL_ERSAL"),String)
            End Get
        End Property
    End Class
End Namespace

</error>