Please help, im getting errors

Theres an error that says invalid expression on 'else if' and 'else' Thanks

using System;

namespace test { class MainClass { public static void Main (string[] args) { Random numberGenerator = new Random ();

        int num01 = numberGenerator.Next (1,11);
        int num02 = numberGenerator.Next (1,11);
        int realAnswer = num01 * num02 ;

        Console.WriteLine ("What is " + num01 + " multiplied by " + num02 + "?");

        int userAnswer = Convert.ToInt32 (Console.ReadLine ());

        if (userAnswer == realAnswer) {
            Console.WriteLine ("Good");
        } else if (userAnswer - realAnswer >= 1 && userAnswer - realAnswer <= 3) {

            int greater = numberGenerator.Next (1, 3);

            switch (greater) {
            case 1:
                Console.WriteLine ("little too high");
            break;

            default:
                Console.WriteLine ("little too much");
                break;

            } else if (realAnswer-userAnswer  >= 1 && realAnswer-userAnswer  <=3) {

                int less = numberGenerator.Next (1, 3);

                switch (less) {
                case 1:
                    Console.WriteLine ("little too low");
                    break;

                default:
                    Console.WriteLine ("go higher!");
                    break;

                } else {

                    Console.WriteLine ("you just suck");

                }

                Console.ReadKey ();

                }
            }
    }
}

}