After loading a dynamic assembly in .NET7, why does the error message "No service for type 'TestPlugins.Plugin1.Service1' has been registered" occur?

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This error message occurs because the assembly is trying to use a service (in this case, 'TestPlugins.Plugin1.Service1') that has not been registered with the DI (Dependency Injection) container. The DI container is responsible for creating and managing instances of services and providing them to other parts of the application that need them. Without registering the service with the container, the assembly is unable to create instances of it and therefore throws this error.