create page layout using ektron CMS Api

Thanks for your reply @Chill60.I have read this article and implement a code
PageModel pageModel = new PageModel();
PageData pageData = new PageData();
pageModel.Get(2, out pageData, false);
WidgetData widget = new Ektron.Cms.PageBuilder.WidgetData();

widget.ControlURL = "ContentBlock.ascx";
widget.ID = 27; // For content block

// You also need to set other properties like Settings, DropID, ColumnID

pageData.Widgets.Add(widget);
pageModel.CheckOut(pageData);
pageModel.Publish(pageData);

But I am getting error "com:user does not have permission";