[HttpException (0x80004005): Cannot find ContentPlaceHolder 'HeadContent' in the master page '/Site3.master', verify content control's ContentPlaceHolderID attribute in the content page.]
System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection) +797
System.Web.UI.Page.get_Master() +54
System.Web.UI.Page.ApplyMasterPage() +14
System.Web.UI.Page.PerformPreInit() +45
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +335
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