[NullReferenceException: Object reference not set to an instance of an object.]
InstutorsWebUI.Class_level.LoadClasses(Int32 ClassID) in F:\GM\Instutors_gm\instutor\InstutorsWebUI\Class-level.aspx.cs:42
InstutorsWebUI.Class_level.Page_Load(Object sender, EventArgs e) in F:\GM\Instutors_gm\instutor\InstutorsWebUI\Class-level.aspx.cs:23
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +52
System.Web.UI.Control.OnLoad(EventArgs e) +97
System.Web.UI.Control.LoadRecursive() +61
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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