History Manager throws error

Question

I have
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
layout="vertical" horizontalAlign="center"
creationComplete="initApp();"
implements="mx.managers.IHistoryManagerClient">
<mx:states>
<mx:State name="partners"/>
</mx:states>
I also have an accordion on currentState="" as follows:
<mx:Accordion width="100%" height="90%"
id="toppage_accordeon" historyManagementEnabled="true">
I also have loadState ans SaveState as follows:
public function initApp() :void
HistoryManager.register(this);
HistoryManager.register(toppage_accordeon);
addEventListener(StateChangeEvent.CURRENT_STATE_CHANGE,
handleStateChange);
initCollections();
* Implementation of saveState() method required by
* the IHistoryManagerClient interface.
public function saveState() :Object
var historyState:Object = new Object();
historyState.currentState = currentState;
return historyState;
* Implementation of loadState() method required by the
* IHistoryManagerClient interface.
public function loadState(historyState:Object) :void
// Temporarily ignore currentStateChange events.
removeEventListener(StateChangeEvent.CURRENT_STATE_CHANGE,
handleStateChange);
if (historyState == null)
{ // TRICKY: Null value indicates that initial state is
required.
currentState = "";
else
currentState = historyState.currentState;
// Listen for currentStateChange events again.
addEventListener(StateChangeEvent.CURRENT_STATE_CHANGE,
handleStateChange);
public function handleStateChange(event:StateChangeEvent)
:void
HistoryManager.save();
When I launch and change the accordion state I get an error
as follows:
TypeError: Error #1009: Il est impossible d'accéder
à la propriété ou à la méthode d'une
référence d'objet nul.
at
mx.managers::HistoryManagerImpl/save()[E:\dev\flex_3_beta2\sdk\frameworks\projects\framew ork\src\mx\managers\HistoryManagerImpl.as:555]
at
mx.managers::HistoryManager$/save()[E:\dev\flex_3_beta2\sdk\frameworks\projects\framework \src\mx\managers\HistoryManager.as:140]
at
mx.containers::Accordion/commitSelectedIndex()[E:\dev\flex_3_beta2\sdk\frameworks\project s\framework\src\mx\containers\Accordion.as:1775]
at
mx.containers::Accordion/commitProperties()[E:\dev\flex_3_beta2\sdk\frameworks\projects\f ramework\src\mx\containers\Accordion.as:1056]
at
mx.core::UIComponent/validateProperties()[E:\dev\flex_3_beta2\sdk\frameworks\projects\fra mework\src\mx\core\UIComponent.as:5552]
at
mx.managers::LayoutManager/validateProperties()[E:\dev\flex_3_beta2\sdk\frameworks\projec ts\framework\src\mx\managers\LayoutManager.as:517]
at
mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\flex_3_beta2\sdk\frameworks\pro jects\framework\src\mx\managers\LayoutManager.as:667]
at Function/
http://adobe.com/AS3/2006/builtin::apply()
at
mx.core::UIComponent/callLaterDispatcher2()[E:\dev\flex_3_beta2\sdk\frameworks\projects\f ramework\src\mx\core\UIComponent.as:8338]
at
mx.core::UIComponent/callLaterDispatcher()[E:\dev\flex_3_beta2\sdk\frameworks\projects\fr amework\src\mx\core\UIComponent.as:8281]
Is this my mistake or an issueon FB 3?
Thx for help.

Answer 1

By the way I aso tried with
<mx:Accordion width="100%" height="90%"
id="toppage_accordeon" historyManagementEnabled="false"> since
implicitly it is enabled. Same result.