I am unable to get the website (<iframe tage is not working>)(Developing an advanced marketplace application)

Hi, 

I am trying to display website in bpm'online but below  code is not working.

define("tsaWebData1Page", [], function() {
    return {
        entitySchemaName: "tsaWebData",
        details: /**SCHEMA_DETAILS*/{}/**SCHEMA_DETAILS*/,
        diff: /**SCHEMA_DIFF*/[
            // Web-page name.
            {
                "operation": "insert",
                "name": "tsaName",
                "values": {
                    "layout": {
                        "colSpan": 24,
                        "rowSpan": 1,
                        "column": 0,
                        "row": 0,
                        "layoutName": "ProfileContainer"
                    },
                    "bindTo": "tsaName"
                },
                "parentName": "ProfileContainer",
                "propertyName": "items",
                "index": 0
            },
            //link to Web-page statistics.
            {
                "operation": "insert",
                "name": "tsaURL",
                "values": {
                    "layout": {
                        "colSpan": 24,
                        "rowSpan": 1,
                        "column": 0,
                        "row": 0,
                        "layoutName": "Header"
                    },
                    "labelConfig": {},
                    "enabled": true,
                    "readonly": true,
                    "bindTo": "tsaURL"
                },
                "parentName": "Header",
                "propertyName": "items",
                "index": 0
            },
            // tab.
            {
                "operation": "insert",
                "name": "TabData",
                "values": {
                    "caption": "Web-данные",
                    "items": []
                },
                "parentName": "Tabs",
                "propertyName": "tabs",
                "index": 0
            },
            // Add URL button.
            {
                "operation": "insert",
                "parentName": "ProfileContainer",
                "propertyName": "items",
                "name": "AddUrlButton",
                "values": {
                    "layout": {
                        "colSpan": 24,
                        "rowSpan": 1,
                        "column": 0,
                        "row": 1
                    },
                    "itemType": Terrasoft.ViewItemType.BUTTON,
                    "caption": {"bindTo": "Resources.Strings.AddUrlButtonCaption"},
                    "click": {"bindTo": "addUrl"},
                    "style": Terrasoft.controls.ButtonEnums.style.BLUE
                }
            },
            //Container with iframe.
            {
                "operation": "insert",
                "name": "IFrameStat",
                "parentName": "TabData",
                "propertyName": "items",
                "values": {
                    "id": "testiframe",
                    "itemType": Terrasoft.ViewItemType.CONTAINER,
                    "selectors": {"wrapEl": "#stat-iframe"},
                    "layout": { "colSpan": 24, "rowSpan": 1, "column": 0, "row": 0 },
                    "html": "",
                    "afterrerender": {
                        "bindTo": "addUrl"
                    }
                }
            }
        ]/**SCHEMA_DIFF*/,
        methods: {
            // data loading handler.
            onEntityInitialized: function() {
                
                this.callParent(arguments);
                
                this.addUrl();
            },
            
            addUrl: function() {
                
                var iframe = Ext.get("stat-iframe");
                if (!iframe) {
                    window.console.error("Tab with iframe not found");
                    return;
                }
                /
                var siteName = this.get("tsaName");
                if (!siteName) {
                    window.console.error("Site name is not set");
                    return;
                }
                
                var url = "https://www.similarweb.com/website/" + siteName;
                
                this.set("tsaURL", url);
                
                iframe.dom.src = url;
            }
        },
        rules: {}
    };
});

PLEASE REFER LINK :https://academy.bpmonline.com/documents/technic-sdkmp/7-11/developing-a…