[InvalidOperationException: This operation requires the page to be asynchronous (the Async attribute must be set to true).]
System.Web.UI.Page.RegisterAsyncTask(PageAsyncTask task) +511
MasterPage.Page_Load(Object sender, EventArgs e) +168
System.Web.UI.Control.OnLoad(EventArgs e) +79
System.Web.UI.Control.LoadRecursive() +130
System.Web.UI.Control.LoadRecursive() +200
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2818
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