FLEX实践—XML HttpService加载错误

主应用代码：

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
						horizontalAlign="center"
						verticalAlign="middle"
						creationComplete="initApp()">
	<mx:Script>
		<!--[CDATA[
		import mx.rpc.events.FaultEvent;
			import mx.rpc.events.ResultEvent;
			
			private function initApp():void
			{
				//Initialize XML load service.
				sevBaseTable.send();
			}
			
			// Load BaseTable.xml
			private function loadBaseTableHandler(event:ResultEvent):void
			{
				connManager.openConnection(dbConnection);
				createDbObj.createTableArray=event.result.tables.table;
				createDbObj.createDatabaseObjects(dbConnection);
				connManager.closeConnection(dbConnection);
				Debug.log("Load BaseTable.xml complete!");
			}
		]]-->
	</mx:Script>	
			
	<mx:HTTPService id="sevBaseTable"
					url="data/BaseTable.xml"
					result="loadBaseTableHandler(event)"/>
</mx:Application>

XML文件：

BaseTable.xml

<?xml version="1.0"?>
<tables>
  <table>
    <name>TRP_USERS</name>
    <statement>CREATE TABLE IF NOT EXISTS TRP_USERS (USER_ID INTEGER PRIMARY KEY AUTOINCREMENT,USER_NAME TEXT,PASSWORD TEXT,CREATION_DATE DATE)</statement>
  </table>
<tables>

运行时会报错：类似空方法的错误

调试结果：

在BaseTable.xml中

添加一个<table></table>节点，则不会再报错。

猜想：可能是当xml文件解析结果只有一个节点时无法识别ArrayCollection。