Hi Dave,

Yes, I have registered the Umbraco API Controllers and it's working fine. API controller received my requests and dependency Injection also applied but the problem is whenever, I tried to login to Umbraco Backend its give me this error see the screenshot which is mention below :

https://www.screencast.com/t/f54kNM9SN7J

It will not render any tree and other Umbraco related stuff.

protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
        {
            var builder = new ContainerBuilder();

        //Register our controllers from this assembly with Autofac
        builder.Register(c => UmbracoContext.Current).AsSelf();
        builder.RegisterInstance(ApplicationContext.Current).AsSelf();
        builder.RegisterControllers(Assembly.GetExecutingAssembly());
        //builder.RegisterApiControllers(typeof(UmbracoApplication).Assembly);
        builder.RegisterApiControllers(Assembly.GetExecutingAssembly());

        //Register types 
        builder.RegisterType<DataFactory>().As<IDataFactory>();


        builder.RegisterAssemblyTypes(typeof(HeaderRepository).Assembly)
       .Where(t => t.Name.EndsWith("Repository"))
       .AsImplementedInterfaces().InstancePerRequest();
        builder.RegisterAssemblyTypes(typeof(HeaderService).Assembly)
       .Where(t => t.Name.EndsWith("Service"))
       .AsImplementedInterfaces().InstancePerRequest();

        //Set up MVC to use Autofac as a dependency resolver
        var container = builder.Build();
        var resolver = new AutofacWebApiDependencyResolver(container);
        GlobalConfiguration.Configuration.DependencyResolver = resolver;
        DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
    }

Hi Dave,

Thanks for your response it was really helpful.

You have also replied in this post as well : https://our.umbraco.org/forum/extending-umbraco-and-using-the-api/82054-umbraco-7-and-autofac-make-sure-that-the-controller-has-a-parameterless-public-constructor