Caused by: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 29; 前言中不允许有内容。

String xmlMsg = HttpKit.readData(request);
log.info("微信渠道支付回调的xmlMsg ------------- " + xmlMsg);
Map<String, String> params = WxPayKit.xmlToMap(xmlMsg);

我用jdom手动解析，或者ijpay去解析都是报这个错

交易单号 4200002352202408125391307575