prog.cs(2,18): error CS8025: Parsing error Compilation failed: 1 error(s), 0 warnings

namespace experiment
{
    class Program
    {
        static void Main(string[] args)
        {
            int t = int.Parse(Console.ReadLine());
            List<int> lines = new List<int>();
            for (int i = 0; i <t; i++)
            {
                lines.Add(int.Parse(Console.ReadLine()));
            }
            foreach (int x in lines)
            {
                int result=1;
                for (int i = x; i>=1; i--)
                {
                    result = result * i;
                }
                Console.WriteLine(result);
            }
            Console.ReadLine();
        }
    }
}

Hi i submitted my code but i keeps telling me error CS8025 Parsing error compilation failed. i don't understand what that means and by the way this was my solution for the small factorial problem