Please find error in the code c#

using System; using System.Collections.Generic; using System.IO; using System.Linq; class Solution { static void Main(String[] args) {

    int[] ar = Array.ConvertAll(Console.ReadLine().Split(' '), arTemp => Convert.ToInt32(arTemp));
    long[] arr = Array.ConvertAll(Console.ReadLine().Split(' '), arTemp => Convert.ToInt64(arTemp));
    long sum = 0;
    List<long> array = new List<long>();
        recorsiveSum(arr, 0, 0, 0, ar[1], ref array);
        var list= array.GroupBy(x => x)
           .Where(g => g.Count() == 1)
           .Select(y => y.Key)
           .ToList();
        sum = list.Sum();
        Console.WriteLine(sum);

}

 static void  recorsiveSum(long[] arr, int ind, long sum,int m,int len, ref List<long> array)
    {
        long sum1 = 0;
        if (m == len)
        {

            m = 0;
                array.Add(sum);
        }
        else
        {
            m++;
        }

        for (int i = ind; i < arr.Length; i++)
        {
            sum1 = sum;
            sum1 += arr[ind];
            ind++;
            recorsiveSum(arr, ind, sum1, m, len, ref array);
        }

    }

}