asp.net mvc 引用unity问题

asp.net mvc项目，用unity4.0遇到以上问题；

Global.asax中
//注入 Ioc
var container = new UnityContainer();
DependencyRegisterType.Container_Sys(ref container);
DependencyResolver.SetResolver(new UnityDependencyResolver(container));

http://www.cnblogs.com/techborther/archive/2012/01/06/2313498.html