Dependency injection using Microsoft.Practices.Unity

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MVC

Hi,
i have mvc api in which in am using Microsoft.Practices.Unity as DI. Below is how my code is.

Controller

public class ZoneController : BaseApiController
{
        private IZoneManager CurrentZoneManager;
        
        public ZoneController(IZoneManager zoneManager)
        {
            if (zoneManager == null)
            {
                throw new ArgumentNullException("Manager");
            }
            CurrentZoneManager = zoneManager;
        }
}

Manager

public class UnitTypeManager : IUnitTypeManager
    {
        static IUnitTypeProvider CurrentUnitTypeProvider;

        public UnitTypeManager(IUnitTypeProvider unitTypeProvider)
        {
            if (unitTypeProvider == null)
            {
                throw new ArgumentNullException("provider");
            }
            CurrentUnitTypeProvider = unitTypeProvider;
        }
}

Provider

public class ZoneProvider : IZoneProvider
    {
        private MobileContext _context;

        public ZoneProvider()
        {
            _context = new MobileContext ();
        }
}

Now this is how i am Registering

public static void RegisterTypes(IUnityContainer container)
        {
          container.RegisterType();
            container.RegisterType(
                new HierarchicalLifetimeManager());
            container.RegisterType(
             new HierarchicalLifetimeManager());
        }

Now i am getting the error "There is no implicit conversion from ZoneTypeManager to IZoneTypeManager"

Can i now have i missed anything