[InvalidOperationException: 可為 Null 的物件必須具有值。]
System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) +60
System.Nullable`1.get_Value() +24
tw_about_index.Page_Load(Object sender, EventArgs e) in d:\web\2022\church\hs611\page\about\index.aspx.cs:23
System.EventHandler.Invoke(Object sender, EventArgs e) +0
System.Web.UI.Control.OnLoad(EventArgs e) +108
System.Web.UI.Control.LoadRecursive() +90
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533
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