[ArgumentNullException: Värde får inte vara null.
Parameternamn: source]
System.Linq.Enumerable.Count(IEnumerable`1 source) +368
ASP.global_asax.Session_Start(Object sender, EventArgs e) in c:\inetpub\wwwroot\Global.asax:90
System.Web.SessionState.SessionStateModule.CompleteAcquireState() +375
System.Web.SessionState.SessionStateModule.BeginAcquireState(Object source, EventArgs e, AsyncCallback cb, Object extraData) +1257
System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +703
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +75
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +158
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