xfire 调用 webservices 报错

调用别人写的webservices 但是报错

Exception in thread "main" org.codehaus.xfire.XFireRuntimeException: Could not invoke service.. Nested exception is org.codehaus.xfire.fault.XFireFault: java.lang.String.isEmpty()Z

本地客户端代码：
Client client = new Client(
new URL(
"http://192.168.1.101/SettingRegistrationPort?wsdl"));
Object[] results = client.invoke("yyghService",
new Object[] { upXml });
System.out.println(results[0]);