No parameterless constructor defined for this object exception while using Unity Container

I am getting the above exception while trynig to load a view.

I am using Unity to intialize my controller instance. Still getting the above error.

Here is my controller.

public class SiteController : Controller
{

    private ISiteRepository _repository;

    public SiteController(ISiteRepository repository)
    {
        _repository = repository;
    }

    //
    // GET: /Site/

    public ActionResult Index()
    {
        return View();
    }

    //
    // GET: /Site/Details/5

    public ActionResult Details(int id)
    {
        return View();
    }}

And here is my Global.asax.cs to

protected void Application_Start()
    {
        ConfigApi(GlobalConfiguration.Configuration);
        AreaRegistration.RegisterAllAreas();

        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        BundleConfig.RegisterBundles(BundleTable.Bundles);
    }

    static void ConfigApi(HttpConfiguration config)
    {
        var unity = new UnityContainer();
        unity.RegisterType<SiteController>();
        unity.RegisterType<ISiteRepository, SiteRepository>(new HierarchicalLifetimeManager());

        config.DependencyResolver = new IocContainer(unity);
    }

Here is my SiteRepository class.

public class SiteRepository:ISiteRepository
{
    private readonly SampleMVCEntities _dbContext;

    public SiteRepository()
    {
        _dbContext = new SampleMVCEntities();
    }

    private IQueryable<SiteConfig> MapSiteConfig()
    {
        return _dbContext.SiteConfigs.Select(a => new SiteConfig
        {
            Name = a.Name,
            LinkColour = a.LinkColour,
            SiteLogo = a.SiteLogo,
            SiteBrands = a.SiteBrands.Select(b => new Models.SiteBrand { SiteId = b.SiteId, BrandId = b.BrandId })
        });
    }

    public IEnumerable<SiteConfig> GetAll()
    {
        return MapSiteConfig().AsEnumerable();
    }}

This is my error stack.

No parameterless constructor defined for this object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.MissingMethodException: No parameterless
constructor defined for this object.

Source Error:

An unhandled exception was generated during the execution of the
current web request. Information regarding the origin and location of
the exception can be identified using the exception stack trace below.

Stack Trace:

[MissingMethodException: No parameterless constructor defined for this
object.] 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) +114
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) +6 System.Web.Mvc.DefaultControllerActivator.Create(RequestContext
requestContext, Type controllerType) +55

[InvalidOperationException: An error occurred when trying to create a
controller of type 'Config.Controllers.SiteController'. Make sure that
the controller has a parameterless public constructor.]
System.Web.Mvc.DefaultControllerActivator.Create(RequestContext
requestContext, Type controllerType) +179
System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext
requestContext, Type controllerType) +80
System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext
requestContext, String controllerName) +74
System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase
httpContext, IController& controller, IControllerFactory& factory)
+197 System.Web.Mvc.<>c_DisplayClass6.b_2() +49 System.Web.Mvc.<>c__DisplayClassb1.<ProcessInApplicationTrust>b__a()
+13 System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +7 System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action
action) +22
System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Func1 func) +88
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase
httpContext, AsyncCallback callback, Object state) +98
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext,
AsyncCallback callback, Object state) +50
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext
context, AsyncCallback cb, Object extraData) +16
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
+268 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

Can somebody help me?

Thanks.