[InvalidOperationException: Nullable object must have a value.]
System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) +56
TFT.Tours.Default.Page_Load(Object sender, EventArgs e) in C:\Users\rbkho\source\repos\TFT\TFT\Tours\Default.aspx.cs:22
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +85
System.Web.UI.Control.OnLoad(EventArgs e) +79
System.Web.UI.Control.LoadRecursive() +130
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2853
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