How do I pass a reflection to access a method that takes an enum as a parameter?

The SportsCar class derives from the base class Car which contains an enum. I am trying to use refelection to access the TurnOnRadio method in the SportsCar class which uses the enum. The value 2 in the line mi.Invoke(obj, new object[] { true, 2 }); is for the enum. When I run the code, I receive an error : Object reference not set to an instance of an object.

Any assistance would be greatly appreciated. Thank you :

static void InvokeMethodWithArgsUsingLateBinding(Assembly asm) { try { // Firstly, get a metadata description of the sports car : Type sport = asm.GetType("CarLibrary2.SportsCar");

            // Now create the sports car :
            object obj = Activator.CreateInstance(sport);

            // Invoke the TurnOnRadio() method which takes 2 arguments :
            MethodInfo mi = sport.GetMethod("TurnOnRadio");

            mi.Invoke(obj, new object[] { true, 2 } );
            
        }
        catch(Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }