Server Error in '/' Application.

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 119:        DataTable dtPlan = Plan.GetPlanByGroup(string.Format(" IsShow=1 AND StartRegisterDate <= '{0}' AND EndRegisterDate >= '{0}' AND (GroupID IN (SELECT ID FROM AC_tblGroupTree WHERE ParentID IN ( SELECT ID FROM AC_tblGroupTree WHERE Code IN ('100','200','300','400'))) OR GroupID = 20)", DateTime.Now.ToString()));
Line 120:
Line 121:        foreach (DataRow dr in dtPlan.Rows)
Line 122:        {
Line 123:            //strPlan += @"<div class='item'><div class='card shadow-sm rounded'>" +

Source File: c:\HostingSpaces\ieltskaraj\ieltskaraj.com\wwwroot\TeacherView.aspx.cs    Line: 121

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   TeacherView.Render(Int32 id) in c:\HostingSpaces\ieltskaraj\ieltskaraj.com\wwwroot\TeacherView.aspx.cs:121
   TeacherView.Page_Load(Object sender, EventArgs e) in c:\HostingSpaces\ieltskaraj\ieltskaraj.com\wwwroot\TeacherView.aspx.cs:37
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +95
   System.Web.UI.Control.LoadRecursive() +59
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3535.0