Finding Missing Dependency on ArgumentNullException on InitializeServiceProvider

[BoasE]

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After some refactorings of an existing system I get the following exception
I assume that i missed a reference to regsiter, but the exception doesn't tell me which type the expcetion is related to.

How can I find the type which is missing a instance and which instance it is?

System.ArgumentNullException: Value cannot be null. (Parameter 'instance')
at Autofac.Core.Activators.ProvidedInstance.ProvidedInstanceActivator.GetType(Object instance)
at Autofac.Core.Activators.ProvidedInstance.ProvidedInstanceActivator..ctor(Object instance)
at Autofac.RegistrationExtensions.RegisterInstance[T](ContainerBuilder builder, T instance)
at Autofac.Extensions.DependencyInjection.AutofacRegistration.Register(ContainerBuilder builder, IEnumerable1 descriptors, Object lifetimeScopeTagForSingletons) at Autofac.Extensions.DependencyInjection.AutofacRegistration.Populate(ContainerBuilder builder, IEnumerable1 descriptors, Object lifetimeScopeTagForSingletons)
at Autofac.Extensions.DependencyInjection.AutofacRegistration.Populate(ContainerBuilder builder, IEnumerable1 descriptors) at Autofac.Extensions.DependencyInjection.AutofacServiceProviderFactory.CreateBuilder(IServiceCollection services) at Microsoft.Extensions.Hosting.Internal.ServiceFactoryAdapter1.CreateBuilder(IServiceCollection services)
at Microsoft.Extensions.Hosting.HostBuilder.InitializeServiceProvider()
at Microsoft.Extensions.Hosting.HostBuilder.Build()

[maliming]

hi

After some refactorings of an existing system I get the following exception

What changes have you made?