how can i fix this error?

using Microsoft.EntityFrameworkCore;

namespace realTimePolls.Models
{
    public class RealTimePollsContext : DbContext
    {
        public RealTimePollsContext(DbContextOptions<RealTimePollsContext> options)
            **: base(options) { }** <-- Error is here

        public DbSet<Poll> Polls { get; set; }
        public DbSet<User> User { get; set; }

        public DbSet<UserPoll> UserPoll { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<Poll>().ToTable("poll"); // Maps the Poll entity to the "poll" table
            modelBuilder.Entity<User>().ToTable("user"); // Maps the User entity to the "user" table
            modelBuilder.Entity<UserPoll>().ToTable("userpoll"); // Maps the User entity to the "user" table
        }
    }
}