Error

System.Web.HttpException (0x80004005): Cannot find ContentPlaceHolder 'PagingBarTop' in the master page '/_WebContent/MasterPages/2013/B.master', verify content control's ContentPlaceHolderID attribute in the content page.
   at System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection)
   at System.Web.UI.Page.ApplyMasterPage()
   at System.Web.UI.Page.PerformPreInit()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Exception of type 'System.Web.HttpUnhandledException' was thrown.

System.Web