The following is my YouTube code, its vertbatem from the book. I get this error message:
Severity and Description Path Resource Location Creation Time Id
1046: Type was not found or was not a compile-time constant: ResultEvent. Chapter 6 youtubeexamp.mxml line 17 1191720037113 352

It is referencing:

public function handleResult(event:ResultEvent):void

here it is:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
    xmlns:local="*"
    creationComplete="src.sec()">

    <mx:Script>
        <![CDATA[

            import mx.rpc.ecents.ResultEvent;
            import mx.utils.ArrayUtil;
            import mx.collections.ArrayCollection;
            import mx.utils.ObjectUtil;

            [Bindable]
            public var videos:ArrayCollection;

            public function handleResult(event:ResultEvent):void
            {
                videos = event.result.ut_response.video_list.video;
            }
        ]]>
    </mx:Script>

    <mx:HTTPService id="srv" url="http://www.youtube.com/api2_rest?method=youtube.videos.list_feature&amp;d ev_id=x01oc-ASJRM"
        useProxy="false"
        result="handleResult(event)" />

    <mx:List width="500" height="500" dataProvider="{videos}">
        <mx:itemRenderer>
            <mx:Component>
                <mx:HBox height="105" verticalAlign="middle" verticalScrollPolicy="off" horizontalScrollPolicy="off">
                    <mx:Image source="{data.thumbnail_url}" />
                    <mx:VBox width="100" height="100" verticalScrollPolicy="off" horizontalScrollPolicy="off">
                        <mx:Label text="{data.title}" fontFamily="Arial" fontSize="12" fontWeight="bold" />
                        <mx:Text text="{data.description}" width="100%" />
                    </mx:VBox>
                </mx:HBox>
            </mx:Component>
        </mx:itemRenderer>
    </mx:List>

</mx:Application>