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System.NullReferenceException: Object reference not set to an instance of an object.
at Dundas.Charting.WebControl.ChartHttpHandler.b(HttpContext )
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)