AIR Auto update error

Question

Hello all,
I am trying to build an autoupdate app in AIR using FB4. I use the code :
import flash.system.System;
        import flash.events.ErrorEvent;
        import air.update.ApplicationUpdaterUI;
        import air.update.events.UpdateEvent;
        [Bindable]
        private var appUpdater:ApplicationUpdaterUI = new ApplicationUpdaterUI();
protected function checkForUpdate():void {
            NativeApplication.nativeApplication.addEventListener( Event.EXITING,
                function(e:Event):void {
                    var opened:Array = NativeApplication.nativeApplication.openedWindows;
                    for (var i:int = 0; i < opened.length; i ++) {
                        opened[i].close();
            setApplicationVersion();
            appUpdater.updateURL = "http://localhost/updateTest/update.xml";
            appUpdater.isCheckForUpdateVisible = false;
            appUpdater.addEventListener(UpdateEvent.INITIALIZED, onUpdate);
            appUpdater.addEventListener(ErrorEvent.ERROR, onError);
            appUpdater.initialize();
        protected function onError(event:ErrorEvent):void {
            Alert.show(event.toString());
        protected function onUpdate(event:UpdateEvent):void {
            appUpdater.checkNow();
        protected function setApplicationVersion():void {
            var appXML:XML = NativeApplication.nativeApplication.applicationDescriptor;
            var ns:Namespace = appXML.namespace();
            ver.text = "Current version is " + appXML.ns::version;
whats wrong in the above code.... when the checkForUpdate function initiated an error occured :
TypeError: Error #1007: Instantiation attempted on a non-constructor.
    at mx.controls::ProgressBar/createChildren()
    at mx.core::UIComponent/initialize()[E:\dev\beta1\frameworks\projects\framework\src\mx\core\ UIComponent.as:6510]
    at mx.core::UIComponent/http://www.adobe.com/2006/flex/mx/internal::childAdded()[E:\dev\beta1\frameworks\projects\ framework\src\mx\core\UIComponent.as:6402]
    at mx.core::Container/http://www.adobe.com/2006/flex/mx/internal::childAdded()[E:\dev\beta1\frameworks\projects\ framework\src\mx\core\Container.as:3879]
    at mx.core::Container/addChildAt()[E:\dev\beta1\frameworks\projects\framework\src\mx\core\Co ntainer.as:2541]
    at mx.core::Container/addChild()[E:\dev\beta1\frameworks\projects\framework\src\mx\core\Cont ainer.as:2459]
    at ApplicationUpdaterDialogs/_ApplicationUpdaterDialogs_ApplicationUpdaterVBox10_c()
    at mx.core::DeferredInstanceFromFunction/getInstance()[E:\dev\beta1\frameworks\projects\fram ework\src\mx\core\DeferredInstanceFromFunction.as:105]
    at mx.states::AddChild/createInstance()
    at mx.states::AddChild/set targetFactory()
    at ApplicationUpdaterDialogs/_ApplicationUpdaterDialogs_AddChild8_i()
    at ApplicationUpdaterDialogs/_ApplicationUpdaterDialogs_State7_c()
    at ApplicationUpdaterDialogs()
    at _ApplicationUpdaterDialogs_mx_managers_SystemManager/create()
    at mx.managers::SystemManager/initializeTopLevelWindow()[E:\dev\beta1\frameworks\projects\fr amework\src\mx\managers\SystemManager.as:3581]
    at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::docFrameHandler()[E:\dev\beta1\frameworks\proj ects\framework\src\mx\managers\SystemManager.as:3400]
    at mx.managers::SystemManager/docFrameListener()[E:\dev\beta1\frameworks\projects\framework\ src\mx\managers\SystemManager.as:3258]

Answer 1

Just Got The Solution for Error 16811 &  16816
Note Following things to avoide update error
No 1.>
You xml schema for update descriptor.xml in  server should look similar to this
<?xml version="1.0" encoding="utf-8"?>
<update xmlns="http://ns.adobe.com/air/framework/update/description/2.5">
  <versionNumber>2.0</versionNumber>
  <url>http://localhost/SerialHunter/SerialHunter.air</url>
  <description><![CDATA[
SerialHunter Version 2.0 by Rajendra Khope
This new version includes:
    * AutoUpdate
    * Enhaced UI functions
    * Ability to add providers       
  ]]></description>
</update>
Note xmlns="http://ns.adobe.com/air/framework/update/description/2.5"
and versionNumber instead of version
Also make similar changes in appxml version field (in Burrito its by default versionNumber )
No 2>
if u are using code to display veesion number make sure it should look like:
var appXML:XML = NativeApplication.nativeApplication.applicationDescriptor;
var ns:Namespace = appXML.namespace();
pnlMain.title=appXML.ns::name+" v "+appXML.ns::versionNumber
Thats it...!
Rajendra Khope
bkrajendra at gmail dot com