Took a.net core, a project dependencies: Service reference IService, DAL reference IDAL, UI reference IService, an error occurred during the process of using Autofac injection , the injection process is in the common layer injected through json config file, run the 'can't find the DLL, but I already DLL manual reference to the user interface (UI), and then directly with the UI all class library reference, still can't find the Service, wide of the mark