I have developed a simple application to test multiselect using EF6 and Sql. List, Create, Edit, and Details actions work. I get an error with delete

The DELETE statement conflicted with the REFERENCE constraint "FK__TaskTeam__TaskId__3B75D760". The conflict occurred in database "multiselect", table "dbo.TaskTeam", column 'TaskId'.

Delete action:

public ActionResult DeleteConfirmed(int id)
        {
            var task = db.Tasks.Find(id);
            db.Tasks.Remove(task ?? throw new InvalidOperationException());
            db.SaveChanges();
            return RedirectToAction("Index");
        }

Entity Model:

public partial class DAL : DbContext
{
    public DAL()
        : base("name=DALEntitites2")
    {
    }
    public virtual DbSet<Tasks> Tasks { get; set; }
    public virtual DbSet<Team> Team { get; set; }
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Tasks>()
            .HasMany(e => e.TeamMembers)
            .WithMany(e => e.Tasks)
            .Map(m => m.ToTable("TaskTeam").MapLeftKey("TaskId").MapRightKey("TeamId"));
    }
}