如何解决：调用BIEE提供的WebService出现SoapException

zhsoldier

求指点迷津，本人刚学BIEE，对BS也不是很精通。谢谢!  
已经添加过WebReference了，代码如下：

protected void Page_Load(object sender, EventArgs e)
    {
        string user = "Administrator";
        string pwd = "Administrator";

        SAWLocale locale = new SAWLocale();
        locale.language = this.Request.UserLanguages[0];

        SAWSessionParameters param = new SAWSessionParameters();
        param.asyncLogon = false;
        param.userAgent = this.Request.UserAgent;
        param.locale = locale;

        //Logon
        SAWSessionService sawSessionService = new SAWSessionService();
        bocom_xxitapvr8.AuthResult result = sawSessionService.logonex(user, pwd, param);
        sawSessionService.keepAlive(new string[] { result.sessionID });

       //Get the session ID
        string sessionID = result.sessionID;

       //
        ReportRef reportRef = new ReportRef();
        reportRef.reportPath = @"/shared/Sample Sales/01 Ranking and Toppers";

        string reportId = "Multi Metrics Proportional Top Ns";

        StartPageParams startPageParams = new StartPageParams();
        startPageParams.idsPrefix = reportId + Math.Round(new Random().NextDouble() * 1000000);
        startPageParams.dontUseHttpCookies = false;

        HtmlViewService htmlService = new HtmlViewService();
        string pageId = htmlService.startPage(startPageParams, sessionID);
        htmlService.addReportToPage(pageId, reportId, reportRef, null, null, null, sessionID);
}

在最后一行，调用addReportToPage的时候，出现 SoapException，异常具体内容如下：
System.Web.Services.Protocols.SoapException was unhandled by user code
  Message="Object expected: /shared/Sample Sales/01 Ranking and Toppers"
  Source="System.Web.Services"
  Actor=""
  Lang=""
  Node=""
  Role=""
  StackTrace:
       at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
       at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
       at bocom_xxitapvr8.HtmlViewService.addReportToPage(String pageID, String reportID, ReportRef report, String reportViewName, ReportParams reportParams, ReportHTMLOptions options, String sessionID) in c:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\website1\51f9447d\fabee748\App_WebReferences.lyaq8fxf.0.cs:line 881
       at _Default.Page_Load(Object sender, EventArgs e) in d:\WebSite1\Default.aspx.cs:line 59
       at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
       at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
       at System.Web.UI.Control.OnLoad(EventArgs e)
       at System.Web.UI.Control.LoadRecursive()
       at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)