Xcode – Swift: how to detect the error type using the debugger?

I’m new in iOS development, so maybe I’m thinking in the wrong way. I coded a view model with a function that calls an API, and everything works fine.

class SearchCityViewModel : ViewModelProtocol {
//OBSERVABLES
var cities = PublishSubject<[City]>()
var networkError = PublishSubject<Void>()
var generalError = PublishSubject<Void>()

init(){
    print("Init SearchCityViewModel")
    reinit()
}

func reinit(){}

func searchCity(stringToSearch: String){
    async {
        do {
            if stringToSearch.count>=2 {
                let cities = try await(api.getCities(cityToSearch: stringToSearch)).payload!
                self.cities.onNext(cities)
            }
            else {
                self.cities.onNext([])
            }
        }
        catch {
            self.generalError.onNext(Void())
        }
    }
}

Now I want to handle errors. In the catch block I want to distinguish all the errors I want to handle gracefully, and for the other ones I just want to emit a general error. To do that, firstly I need to know which error is thrown when the situation I want to handle occurs. I usually do this with the debugger. For instance, I disable the internet connection, and i create a breakpoint inside the catch block. The idea is to check which error is thrown when the internet connection is disabled, in order to create a catch block for that kind of error.

Image of the debugger

I’m struggling because with the debugger I only see that is an AFError instance, but it’s not telling me nothing more that can help me to catch it.

What is wrong with my workflow? Do I really need to read all the docs every time? For each library I use?

Thank you!