关于webserver(100)

装了一个Microsoft SOAP SDK 在使用 szstr:='http://soft.wopos.com/webservice/weather.asmx';
SoapClient := CreateOleObject('MSSOAP.SoapClient');
SoapClient.ClientProperty('ServerHTTPRequest') := True;
SoapClient.mssoapinit(szstr);
showmessage(SoapClient.getWeather('北京'));时 SoapClient.mssoapinit(szstr);这句总是报错 求解决