[ArgumentException: Item has already been added. Key in dictionary: 'NumberOfUsersOnline' Key being added: 'NumberOfUsersOnline']
System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add) +13134420
System.Collections.Hashtable.Add(Object key, Object value) +16
System.Collections.Specialized.NameObjectCollectionBase.BaseAdd(String name, Object value) +88
System.Collections.Specialized.NameObjectCollectionBase.BaseSet(String name, Object value) +45
System.Web.SessionState.SessionStateItemCollection.set_Item(String name, Object value) +31
System.Web.SessionState.HttpSessionStateContainer.set_Item(String name, Object value) +16
System.Web.SessionState.HttpSessionState.Add(String name, Object value) +16
YourPoint.SessionManager.get_NumberOfUsersOnline() in E:\Projects\CMS\App_Code\SessionManager.cs:801
YourPoint.Controls_LoginToSite.Page_Load(Object sender, EventArgs e) in C:\inetpub\vhosts\u0545844.plsk.regruhosting.ru\prozarium.ru\Controls\LoginToSite.ascx.cs:34
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.Control.LoadRecursive() +134
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Control.LoadRecursive() +134
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693
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