这个错在哪里？
错误提示：无法将“<mx:Component>”解析为组件执行。

Java code

<?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"                xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">    <s:layout>        <s:BasicLayout/>    </s:layout>        <mx:DataGrid x="29" y="303" width="694" height="190" dataProvider="{testData.book}" variableRowHeight="true">        <mx:columns>            <mx:DataGridColumn headerText="Pub Date" dataField="date" width="85" />            <mx:DataGridColumn headerText="Author" dataField="author" width="125"/>            <mx:DataGridColumn headerText="Title" dataField="title">                <mx:itemRenderer>                    <mx:Component>                        <mx:HBox paddingLeft="2">                            <mx:Script>                                <![CDATA[                                private var _data:Object;                                override public function set data( value:Object ) : void {                                //super.data = value;                                _data = value                                var today:Number = (new Date()).time;                                var pubDate:Number = Date.parse(data.date);                                if( pubDate > today ) setStyle("backgroundColor",0x0);                                else setStyle("backgroundColor",0xffffff);                                }                                override public function get data():Object{                                return this._data;                                }                                ]]>                            </mx:Script>                        </mx:HBox>                    </mx:Component>                </mx:itemRenderer>            </mx:DataGridColumn>        </mx:columns>    </mx:DataGrid>    <fx:Declarations>                     </fx:Declarations></s:Application>