AutoFac.Core.DependencyResolutionException after following tutorial

Anyone know what might be causing this error?

builder.RegisterType<IDomainRepository>().As<IDomainRepository>();
                     ^^

should be

builder.RegisterType<DomainRepository>().As<IDomainRepository>();
                     ^

because you need to RegisterType of the Concrete type, not the interface.

Autofac Registration Concepts

Excerpt:

Any component type you register via RegisterType must be a concrete type.

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