[HttpException (0x80004005): 无法在母版页“/Master/Channel.master”中找到 ContentPlaceHolder“sidebar”,请验证内容页中内容控件的 ContentPlaceHolderID 属性。]
System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection) +8773479
System.Web.UI.Page.get_Master() +51
System.Web.UI.Page.ApplyMasterPage() +15
System.Web.UI.Page.PerformPreInit() +45
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +282
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