Необработанное исключение типа "System.ArgumentOutOfRangeException" - C#

namespace ConsoleApplication1 {
    class sotrudnik
    {
        public string fam;
        public string im;
        public string ot;
        public int tnomer;
        public string d;
        public string department;
        public string post;
    }
    
    class organization
    {
        public List<sotrudnik> x = new List<sotrudnik>();
        public List<argument> y = new List<argument>();
        public void Read2()
        {
            StreamReader stream = new StreamReader("d:/lab1.txt", System.Text.Encoding.Default);
            string str;
            int i = 0;
            while (stream.EndOfStream == false)
            {
                str = stream.ReadLine();
                var splitted = str.Split(' ');
                Console.WriteLine("{0} {1} {2} {3} {4} {5}", splitted[0], splitted[1], splitted[2], splitted[3], splitted[4], splitted[5]);
               x[i].fam=splitted[0]; x[i].im=splitted[1]; x[i].ot=splitted[2]; x[i].tnomer = Int32.Parse(splitted[3]); x[i].department = splitted[4]; x[i].post = splitted[5]; x[i].d = splitted[6];
                i++;
            }
            Console.WriteLine("Запись закончена");
            stream.Close();
            output();
        }
        public void output()
        {
            for (int i=0; i<x.Count; i++)
            {
                Console.WriteLine("{0} {1} {2} {3} {4} {5} {6} /n", x[i].fam, x[i].im, x[i].ot, x[i].tnomer, x[i].department, x[i].post, x[i].d);
            }
            Console.ReadKey();
        }
     class program { 
        static void Main(string[] args)
        {
            int j;//j-индекс меню,
            organization c = new organization();
            c.Read2();
        }

 x[i].fam=splitted[0]; x[i].im=splitted[1]; x[i].ot=splitted[2]; x[i].tnomer = Int32.Parse(splitted[3]); x[i].department = splitted[4]; x[i].post = splitted[5]; x[i].d = splitted[6];