Structuremap does not work on MVC4

I've used StructureMap in MVC2/3 many times without any concern, but I guess handling IoC is different in MVC4. When i used StructureMap for handling IoC in MVC4 I get the following exception.:

No parameterless constructor defined for this object

Why? I have not found any correct result in google except this: IoC Not Working In MVC4 These is my IoC classes:

public static class IoC {
    public static IContainer Initialize() {
        ObjectFactory.Initialize(x =>
                    {
                        x.Scan(scan =>
                        {
                            //scan.Assembly("DLL.Core");
                            scan.Assembly("DLL.CMS");
                            scan.TheCallingAssembly();
                            scan.WithDefaultConventions();
                        });
                        x.For<IDbContext>().Use<ModelEntities>();
                        x.For(typeof(IRepository<>)).Use(typeof(Repository<>));
                        x.For<IHttpControllerActivator>();
                        x.For<IController>();
                    });

        return ObjectFactory.Container;
    }

And SmDependencyResolver is:

    public class SmDependencyResolver : IDependencyResolver
{
    private readonly IContainer _container;

    public SmDependencyResolver(IContainer container)
    {
        _container = container;
    }

    public object GetService(Type serviceType)
    {
        if (serviceType == null) return null;
        try
        {
            return serviceType.IsAbstract || serviceType.IsInterface
                     ? _container.TryGetInstance(serviceType)
                     : _container.GetInstance(serviceType);
        }
        catch
        {

            return null;