Error: [IOErrorEvent type="ioError" bubbles=false cancelable=false eventPhase=2 text="Error #2032: Error de secuencia. URL: http://localhost:8080/root/test"]. URL: http://localhost:8080/root/test

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
               xmlns:s="library://ns.adobe.com/flex/spark"
               xmlns:mx="library://ns.adobe.com/flex/mx"
               minWidth="955" minHeight="600">
        <fx:Declarations>
            <s:HTTPService
                id="httpSerciseTest"
                url="/root/test"
                method="GET"
                resultFormat="e4x"
                useProxy="false"
                result="resultHandler(event)"
                fault="Alert.show(event.fault.faultString+
                'n' + event.fault.faultDetail,
                'Error: '+event.fault.faultCode)"/>
        </fx:Declarations>
        <fx:Script>
            <![CDATA[
                import mx.controls.Alert;
                import mx.rpc.events.FaultEvent;
                import mx.rpc.events.ResultEvent;

                [Bindable]private var xmlResult:XML;
                private function creationCompleteHandler():void
                {
                    httpSerciseTest.send();
                }
                private function resultHandler(event:ResultEvent):void
                {
                    xmlResult=event.result as XML;
                }
            ]]>
        </fx:Script>
</s:Application>

public class Test extends HttpServlet {
    private static final long serialVersionUID = 4484874511692568559L;
    private static final String CONTENT_TYPE = "text/xml; charset=utf-8";
    protected void doGet(HttpServletRequest request, HttpServletResponse response)throws IOException
    {
        response.setContentType(CONTENT_TYPE);
        try{
            PrintWriter writer=response.getWriter();
            writer.println("<?xml version="1.0"?>n");
            writer.println("<root>");
            writer.println("<folder label="Repository"/>");
            writer.println("<folder label="Documentation"/>");
            writer.println("</root>");
        }catch (IOException IOE){
            throw IOE;
        }
    }
}

<servlet>
        <servlet-name>test</servlet-name>
        <display-name>test</display-name>
        <servlet-class>java_servlets.Test</servlet-class>
    </servlet>
<servlet-mapping>
        <servlet-name>test</servlet-name>
        <url-pattern>/test</url-pattern>
    </servlet-mapping>