“/”应用程序中的服务器错误。

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行 3827:            sql = "select fatherId, name,jumpURL,defaultpage,template,fatherId,id,classify from info_class where id =" + c;
行 3828:            OleDbDataReader dr = con.DrSelect(sql, null);
行 3829:            if (dr.Read())
行 3830:            {
行 3831:                string url = "";

[NullReferenceException: 未将对象引用设置到对象的实例。]
   jss_fc.JSSMethods.loadcolumn(String f, String c, OperateDB con) in d:\website\lajs_netweb\App_Code\jss_fc\JSSMethods.cs:3829
   jss_fc.JSSMethods.loadcolumn(String f, String c, OperateDB con) in d:\website\lajs_netweb\App_Code\jss_fc\JSSMethods.cs:3835
   jss_fc.JSSMethods.mt_columnjl(String tagename, OperateDB con, String[] param, String[] idsparam) in d:\website\lajs_netweb\App_Code\jss_fc\JSSMethods.cs:1426
   jss_fc.JSSMethods.TAGES_SINGLE(String tagename, OperateDB con, String[] param, String[] idsparam) in d:\website\lajs_netweb\App_Code\jss_fc\JSSMethods.cs:183
   info.Page_Load(Object sender, EventArgs e) in d:\website\lajs_netweb\info.aspx.cs:64
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +24
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +136
   System.Web.UI.Control.LoadRecursive() +97
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2523