TextLayout error 1009

Question

I have a web chat room application used textflow to render the user message embed swf emotions. After I updated to flex 4.5 sdk, I get these errors oftenly and I just can't debug with it so I don't where went wrong exactly. Please Help me out , or just point out in what situtation will cause this error
Thanks a lot
TypeError: Error #1009:
       at flashx.textLayout.container::ContainerController/http://ns.adobe.com/textLayout/internal/2008::updateGraphics()[C:\Vellum\branches\v2\2.0\d ev\output\openSource\textLayout\src\flashx\textLayout\container\ContainerController.as:318 2]
       at flashx.textLayout.container::ContainerController/http://ns.adobe.com/textLayout/internal/2008::updateCompositionShapes()[C:\Vellum\branches \v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\container\ContainerControll er.as:3080]
       at flashx.textLayout.compose::StandardFlowComposer/updateCompositionShapes()[C:\Vellum\branc hes\v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\compose\StandardFlowComp oser.as:616]
       at flashx.textLayout.compose::StandardFlowComposer/updateToController()[C:\Vellum\branches\v 2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\compose\StandardFlowComposer. as:559]
       at flashx.textLayout.compose::StandardFlowComposer/updateAllControllers()[C:\Vellum\branches \v2\2.0\dev\output\openSource\textLayout\src\flashx\textLayout\compose\StandardFlowCompose r.as:517]
       at flashx.textLayout.container::TextContainerManager/updateContainer()[C:\Vellum\branches\v2 \2.0\dev\output\openSource\textLayout\src\flashx\textLayout\container\TextContainerManager .as:1343]
       at spark.components::RichEditableText/updateDisplayList()[E:\dev\hero_private\frameworks\pro jects\spark\src\spark\components\RichEditableText.as:2944]
       at mx.core::UIComponent/validateDisplayList()[E:\dev\hero_private\frameworks\projects\framew ork\src\mx\core\UIComponent.as:8989]
       at mx.managers::LayoutManager/validateDisplayList()[E:\dev\hero_private\frameworks\projects\ framework\src\mx\managers\LayoutManager.as:736]
       at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\hero_private\frameworks\project s\framework\src\mx\managers\LayoutManager.as:819]
       at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\hero_private\frameworks \projects\framework\src\mx\managers\LayoutManager.as:1180]

Answer 1

Ok,I reproduce it with the code below, replace the 04.swf with any small swf animation is ok
click the button will raise the exception
Is there any workaround ?
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
                               xmlns:s="library://ns.adobe.com/flex/spark"  creationComplete="application1_creationCompleteHandler(event)"
                               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="400" minHeight="300" xmlns:local="*"
                                >
         <fx:Script>
                   <![CDATA[
                            import flashx.textLayout.elements.InlineGraphicElement;
                            import flashx.textLayout.elements.ParagraphElement;
                            import flashx.textLayout.elements.TextFlow;
                            import flashx.textLayout.formats.WhiteSpaceCollapse;
                            import mx.events.FlexEvent;
                            import spark.utils.TextFlowUtil;
                            [Bindable]
                            private var chatTLF:TextFlow;
                            protected function application1_creationCompleteHandler(event:FlexEvent):void
                                    var str:String = "";
                                     var i:int = 30;
                                     while(i>0){
                                               str += i+"\n"
                                               i--;
                                    chatTLF = TextFlowUtil.importFromString(str,WhiteSpaceCollapse.PRESERVE);
                                     var p:ParagraphElement = new ParagraphElement();
                                     var graphicElement:InlineGraphicElement = new InlineGraphicElement();
                                     graphicElement.source = "04.swf";
                                     graphicElement.width  = 28;
                                     graphicElement.height = 30;
                                     p.addChild(graphicElement);
                                     chatTLF.addChildAt(0,p);
                            protected function chatContentBox_updateCompleteHandler(event:FlexEvent):void
                                     callLater(function():void{
                                               scroller.verticalScrollBar.viewport.verticalScrollPosition = scroller.verticalScrollBar.maximum;
                            protected function button1_clickHandler(event:MouseEvent):void
                                     var tf:TextFlow = TextFlowUtil.importFromString("aaa",WhiteSpaceCollapse.PRESERVE);
                                     for each(var p:ParagraphElement in tf.mxmlChildren){
                                               chatTLF.addChild(p);
                   ]]>
         </fx:Script>
         <fx:Declarations>
                   <!-- Place non-visual elements (e.g., services, value objects) here -->
         </fx:Declarations>
         <s:Scroller id="scroller" x="10" y="10" width="138" height="226" verticalScrollPolicy="on">
                   <s:RichEditableText id="chatContentBox" editable="false" focusEnabled="false"  updateComplete="chatContentBox_updateCompleteHandler(event)"
                                                                 textAlign="left" textFlow="{chatTLF}"/>
         </s:Scroller >
         <s:Button x="62" y="288" click="button1_clickHandler(event)" label="click me"/>
</s:Application>