UserVoice API Null Ref

UserVoice Api

    class Program
    {
        static string SUBDOMAIN_NAME = "codeinside";
        static string API_KEY = "...";
        static string API_SECRET = "...";

        
        public static void Main()
        {
            // https://codeinside.uservoice.com/forums/55132-general
            var client = new UserVoice.Client(SUBDOMAIN_NAME, API_KEY, API_SECRET);
            var result = client.GetCollection("/api/v1/forums/55132/suggestions.json");
            Console.WriteLine(result.Count); // Null Ref... :(

        }

    }