Delphi 2009：使用TIdHttpWebBrokerBridge时“XML文档必须具有顶级元素”错误

We have a app which uses HttpWebBrokerBridge, it works fine in Delphi2006 but when I recompile using Delphi2009 I get EDOMParserError exception with message "XML document must have a top level element".We have a app which uses HttpWebBrokerBridge, i