ASP.Net Core Error: No suitable constructor found for entity type Model. The following parameters could not be bound

Error: No suitable constructor found for entity type Model. The following parameters could not be bound t

so this will automatically create table in database with these properties, but it's not working, still same error for suitable constructor!, how can i create that constructor correctly, i am using asp.net core2.1

My model 

    public class User : Iuser
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int? Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Email { get; set; }
        [NotMapped]
        public string Password { get; set; }
        [NotMapped]
        public string ConfirmPassword { get; set; }
        public string Hash { get; set; }
        public string Salt { get; set; }
        public DateTime? CreatedOn { get; set; }
        

        public User(int? id = null, string firstname = null, string lastname = null, string email = null, string password = null, string confirmpassword = null)
        {
            this.Id = id;
            this.FirstName = firstname;
            this.LastName = lastname;
            this.Email = email;
            this.Password = password;
            this.ConfirmPassword = confirmpassword;
        }

         
        public User(Iuser obj)
        {
            this.Id = obj.Id;
            this.FirstName = obj.FirstName;
            this.LastName = obj.LastName;
            this.Email = obj.Email;
            this.Password = obj.Password;
            this.ConfirmPassword = obj.ConfirmPassword;
        }
         

my Context`

public class UserContext : BaseDbContext
    {
        public DbSet<User> Users { get; set; }
 
        public UserContext()
        {
        }

       public UserContext(DbContextOptions<UserContext> options):base(options) { }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseSqlServer(CL.Config.DbConfig.ConnectionString);
        }
       
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<User>(u =>
            {
                u.HasKey(e => e.Id);
                u.Property(e => e.FirstName);
                u.Property(e => e.LastName);
                u.Property(e => e.Email);
                u.Property(e => e.Password);
                u.Property(e => e.ConfirmPassword);
                u.Property(e => e.Salt);
                u.Property(b => b.Hash);
            });
        }

        public void AddUser(User entity)
        {
            using (UserContext context = new UserContext())
            {
                entity.CreatedOn = DateTime.Now;
              nfigFile(entity.Password, "MD5");
                context.Users.Add(entity);
                context.SaveChanges();
            }

        }
    }

(BaseDbContext inherits from DbContext)