EXT.Window autoLoad URL not working in EXTJS-5.1 But it works in ExtJS-4.2

var w = new Ext.Window({

autoLoad: {

url: "someApplicationURL",

params: {

firstName: "anyName",

lastName: "anyName"

},

callback: someCallbackFuncion,

scope: someObjectObject,

discardUrl: true,

nocache: true,

text: "Loading...",

timeout: 60,

scripts: false

},

height: 300,

width: 600

});

The above one works well in EXTJS 4.2 But not working in EXTJS-5.1

EXT.Window autoLoad URL not working in EXTJS-5.1 But it works in ExtJS-4.2