[NullReferenceException: Object reference not set to an instance of an object.]
Ertip.Ertip.Page_Load(Object sender, EventArgs e) in C:\Users\pc\Documents\Visual Studio 2017\Projects\Visual Studio 2012 Projects\Ertipmedical\Ertip\Ertip.Master.cs:104
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.Control.LoadRecursive() +131
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678
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