[InvalidCastException: Unable to cast object of type 'ASP.professorstudymanuals_aspx' to type 'BookstoreEngine.Helpers.BasePage'.]
Actex.ActexMasterPage.HandleLogout() in D:\projects\Pinnacle\Actex\ActexMasterPage.cs:35
Actex.ActexMasterPage.OnPreRender(EventArgs e) in D:\projects\Pinnacle\Actex\ActexMasterPage.cs:27
System.Web.UI.<PreRenderRecursiveInternalAsync>d__249.MoveNext() +638
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) +102
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) +64
System.Web.UI.<PreRenderRecursiveInternalAsync>d__249.MoveNext() +1166
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() +7482
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