'System.Web.Mvc.HtmlHelper'不包含'RenderPartial'的定义 - ASP.Net MVC

I've been trying to run ASP.Net MVC 1.0 on one machine, but can't get past this. I create a new MVC project (C#). It creates all the folders, views, controllers, models etc. All good. Then, when I hit F5, I get the following:I've been trying to run ASP.Net MVC 1.0 on one