“/”应用程序中的服务器错误。

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行 323:            {
行 324:                var Column = DbHelper.CurrentDb.SingleOrDefault(ColumnId);
行 325:                url = Whir.ezEIP.Web.SysManagePageBase.Insten.AppName + "/" + Column.Path + "/" + lastPath.ToString();   //产品描述页
行 326:            }
行 327:        }

[NullReferenceException: 未将对象引用设置到对象的实例。]
   UrlHelper.AnalysisUrl(String url) in d:\web\App_Code\UrlHelper.cs:325
   UrlHelper.AnalysisUrl(String url, String parms) in d:\web\App_Code\UrlHelper.cs:191
   ASP.global_asax.Application_BeginRequest(Object sender, EventArgs e) in d:\web\Global.asax:50
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +141
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +48
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +71