[HttpException (0x80004005): Cannot find ContentPlaceHolder 'MainContent' in the master page '/Site.Master', verify content control's ContentPlaceHolderID attribute in the content page.]
System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection) +603
System.Web.UI.Page.get_Master() +56
System.Web.UI.Page.ApplyMasterPage() +15
System.Web.UI.<PerformPreInitAsync>d__495.MoveNext() +389
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
System.Web.Util.WithinCancellableCallbackTaskAwaiter.GetResult() +32
System.Web.UI.<ProcessRequestMainAsync>d__523.MoveNext() +2142
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