C# how to serialize property of type class Newtonsoft [duplicate]

Question

 public class Driver : BaseEntity
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string FullName => $"{FirstName} {LastName}";
        public Shift? Shift { get; set; }
        public Car Car { get; set; }
        public string Licence { get; set; }
        public DateTime LicenceExpiery { get; set; }
     }




public class Car : BaseEntity
    {
        public string Model { get; set; }
        public string LicensePlate { get; set; }
        public DateTime LicensePlateExpieryDate { get; set; }
        public List<Driver> AssasignedDrivers { get; set; }
    }

I have two classes like shown above and im trying to serialize them to json , im using Newtonsoft for serialization and deserialization , but when im trying to do so i'm getting the following exceptions :

Self referencing loop detected with type 'Taxi_Manager.Domain.Entities.Driver'. Path '[0].Car.AssasignedDrivers'.

Self referencing loop detected for property 'Car' with type 'Taxi_Manager.Domain.Entities.Car'. Path '[0].AssasignedDrivers[0]'.

what could be the problem ?