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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 19: // Session["Start"] = DateTime.Now; Line 20: Application.Lock(); Line 21: Application["VisitorOnline"] = (int)Application["VisitorOnline"] + 1; Line 22: Application.UnLock(); Line 23: }
Source File: d:\Website\tudu\web\global.asax Line: 21 Stack Trace:
[NullReferenceException: Object reference not set to an instance of an object.] ASP.global_asax.Session_Start(Object Sender, EventArgs E) in d:\Website\tudu\web\global.asax:21 System.Web.SessionState.SessionStateModule.RaiseOnStart(EventArgs e) +10073211 System.Web.SessionState.SessionStateModule.CompleteAcquireState() +160 System.Web.SessionState.SessionStateModule.BeginAcquireState(Object source, EventArgs e, AsyncCallback cb, Object extraData) +1095 System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +254 System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +48 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +159
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.4136.0

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