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我已经开始使用LightInject，但No parameterless constructor defined for this object出现错误。代码如下，

全球.asax.cs：

protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();
    RouteConfig.RegisterRoutes(RouteTable.Routes);

    var container = new ServiceContainer();
    container.Register<IEmployeeRepository, EmployeeRepository>();
    container.RegisterControllers();
    container.EnableMvc();
}

控制器：

public HomeController(IEmployeeRepository repo)
{
    repository = repo;
}

谁能帮我。

堆栈跟踪：

[MissingMethodException: 没有为此对象定义无参数构造函数。] System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0
System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +113
System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +232 System.Activator.CreateInstance(Type type, Boolean nonPublic) +83 System.Activator.CreateInstance(Type type ) +66 System.Web.Mvc.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) +110

[InvalidOperationException：尝试创建类型为“TestTools.Controllers.HomeController”的控制器时发生错误。确保控制器有一个无参数的公共构造函数。]
System.Web.Mvc.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) +247
System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) +438
System. Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName) +226
System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& 控制器, IControllerFactory& factory) +326 System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback 回调, 对象状态) +157
System.Web.Mvc.MvcHandler。 BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +88
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +50
System.Web.CallHandlerExecutionStep.System.Web。 HttpApplication.IExecutionStep.Execute() +301 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

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