源代码：
 reportDocument = new ReportDocument();
 reportDocument.Load(Server.MapPath("CG_CGDD_Report.rpt"));
 reportDocument.SetDataSource(ds);
 ReportViewer.ReportSource = reportDocument;


 错误提示：
[COMException (0x80040154): 没有注册类别 - SDAVUtil]
   CrystalDecisions.ReportAppServer.ClientDoc.ReportClientDocumentClass.Open(Object& DocumentPath, Int32 Options) +0
   CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.Open(Object& DocumentPath, Int32 Options) +95
   CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.EnsureDocumentIsOpened() +271

[CrystalReportsException: 加载报表失败。]
   CrystalDecisions.ReportAppServer.ReportClientDocumentWrapper.EnsureDocumentIsOpened() +334
   CrystalDecisions.CrystalReports.Engine.ReportDocument.Load(String filename, OpenReportMethod openMethod, Int16 parentJob) +894
   CrystalDecisions.CrystalReports.Engine.ReportDocument.Load(String filename) +84
   Maticsoft.Web.Report.CaiGou.CG_CGDD_Report1.ConfigureCrystalReports() in D:\Printsoftwareweb\Web\Admin\Report\CaiGou\CG_CGDD\CG_CGDD_Report.aspx.cs:60
   Maticsoft.Web.Report.CaiGou.CG_CGDD_Report1.Page_Init(Object sender, EventArgs e) in D:\Printsoftwareweb\Web\Admin\Report\CaiGou\CG_CGDD\CG_CGDD_Report.aspx.cs:72
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnInit(EventArgs e) +99
   System.Web.UI.Page.OnInit(EventArgs e) +12
   System.Web.UI.Control.InitRecursive(Control namingContainer) +333
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +378

 在编译状态下都正常，但是一在IIS中一运行就不行了，请问是什么问题？