Very simple library with one MXML component ERROR

Question

<?xml version="1.0" encoding="utf-8"?>
<s:Group xmlns:fx="http://ns.adobe.com/mxml/2009"
                     xmlns:s="library://ns.adobe.com/flex/spark"
                     xmlns:mx="library://ns.adobe.com/flex/mx"
                     mouseDown="FlexGlobals.topLevelApplication.nativeWindow.startMove()"
                     width="350" height="42" top="0" left="0" right="0">
          <s:states>
                    <mx:State name="maxed"/>
                    <mx:State name="restored"/>
          </s:states>
          <fx:Script>
                    <![CDATA[
                              import flash.events.MouseEvent;
                              import mx.core.FlexGlobals;
                              private var maxed:Boolean = false;
                              private function restore(e:MouseEvent):void{
                                        if (maxed){
                                                  FlexGlobals.topLevelApplication.restore();
                                                  this.currentState = "restored";
                                                  maxed = false;
                                        }else{
                                                  FlexGlobals.topLevelApplication.maximize();
                                                  this.currentState = "maxed";
                                                  maxed = true;
                              public function Maximize() : void
                                        if (this.maxed)
                                                  FlexGlobals.topLevelApplication.restore();
                                                  this.currentState = "restored";
                                                  this.maxed = false;
                                        else
                                                  FlexGlobals.topLevelApplication.maximize();
                                                  this.currentState = "maxed";
                                                  this.maxed = true;
                                        return;
                              }// end function
                              public function get Maximized():Boolean{
                                        return this.maxed;
                    ]]>
          </fx:Script>
          <s:Rect left="0" top="0" bottom="0" right="0">
                    <s:fill>
                              <s:SolidColor color="#FFFFFF"/>
                    </s:fill>
          </s:Rect>
          <s:Image x="5" y="-4" source="assets/colibright_title.png" left="5"/>
          <s:Button y="10" width="32" height="32" click="FlexGlobals.topLevelApplication.minimize();" icon="assets/icons/minimize.png" y.restored="5" y.maxed="5" right.restored="74" right.maxed="74"/>
          <s:Button width="32" height="32" click="restore(event)" y="5" icon="assets/icons/restore.png" includeIn="maxed" right="39"/>
          <s:Button y="5"  click="restore(event)"  includeIn="restored" width="32" height="32" icon="assets/icons/maximize.png" right="39"/>
          <s:Button y="10" width="32" height="32" click="FlexGlobals.topLevelApplication.close();" icon="assets/icons/close.png" y.restored="5" y.maxed="5" right.restored="5" right.maxed="5"/>
</s:Group>
In my main application when i try to load the SWF and use the Custom MXML Component i get this error
[SWF] C:\Users\dude\Adobe Flash Builder 4.7\Colibr8\bin-debug\extensions\00 - WindowControlUIPlugin.swf - 8,287 bytes after decompression
VerifyError: Error #1014: Class spark.components::Group could not be found.
private function launchPluginsInspection():void{
                              plLoader = new Loader();
                              plLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onPluginLoaded);
                              var context:LoaderContext = new LoaderContext(false, ApplicationDomain.currentDomain);
                              context.allowLoadBytesCodeExecution = true;
                              context.allowCodeImport = true;
                              var appFolder:File = File.applicationDirectory;
                              var extensionsFolder:File = new File(appFolder.nativePath + "/extensions/");
                              if (extensionsFolder.isDirectory){
                                        var files:Array = extensionsFolder.getDirectoryListing();
                                        for each(var file:File in files){
                                                  if (file.extension == "swf")
                                                            plLoader.load(new URLRequest(file.nativePath), context);
Why is this happening?

Answer 1

Can you try giving permissions for the player to access your swf file by adding this
Security.allowDomain( '<Location of the swf file>' );
or  
System.security.allowDomain( '<location of the swf file>' );
Thanks,
Sudhir