Cannot read property 'CanInvokeMethod' of null -- PM error in siebel open UI

Hi,

We are trying to run a custom PM file and it is error out in console page as below.

Cannot read property 'CanInvokeMethod' of null -- PM error in siebel open UI

I'm attaching my PM file here. Can you please let us know if anybody come across this issue earlier.

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if (typeof(SiebelAppFacade.OrderStatusPModel) === "undefined") {

    SiebelJS.Namespace("SiebelAppFacade.OrderStatusPModel");

    console.log("inside pmodel namespace");

    SiebelApp.S_App.RegisterConstructorAgainstKey("OrderStatusPhysicalModel","SiebelAppFacade.OrderStatusPModel");

        SiebelAppFacade.OrderStatusPModel = (function() {

            function OrderStatusPModel(proxy) {

                console.log("inside pmodel");

                SiebelAppFacade.OrderStatusPModel.superclass.constructor.call(this, proxy);

            }

            // To pass array of arguments, use 'apply' instead of 'call'