Why am I getting the error “Cannot instantiate implementation type” for my generic service?

Question

I have a generic repository that I have been instantiating right in my WEB API Controller no problem for a while.

This is what my controller used to look like:

Answer 1

I'm an idiot. I had the Inteface for the implementation. I changed:

services.AddScoped(typeof(IGenericService<>), typeof(IGenericService<>));

to

services.AddScoped(typeof(IGenericService<>), typeof(GenericService<>));