Error in module "System.Web"
  Cannot find ContentPlaceHolder 'Sidebar1ContentPlaceHolder' in the master page '2col.master', verify content control's ContentPlaceHolderID attribute in the content page.
  System.Web.UI.MasterPage CreateMaster(System.Web.UI.TemplateControl, System.Web.HttpContext, System.Web.VirtualPath, System.Collections.IDictionary)
An error occured at
  • System.Web.UI.MasterPage.CreateMaster(TemplateControl owner, HttpContext context, VirtualPath masterPageFile, IDictionary contentTemplateCollection)
  • System.Web.UI.Page.get_Master()
  • AX.Starter.Main.Page_PreInit(Object sender, EventArgs e)
  • System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
  • System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
  • System.Web.UI.Page.OnPreInit(EventArgs e)
  • System.Web.UI.Page.PerformPreInit()
  • System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  •