Dynamic LINQ: Comparing Nested Data With Parent Property

I teach a class that is structured as follows:

 public class BestWayContext
{
    public Preference Preference { get; set; }
    public DateTime DueDate { get; set; }
    public List<ServiceRate> ServiceRate { get; set; }
}

public class ServiceRate
{
    public int Id { get; set; }
    public string Carrier { get; set; }
    public string Service { get; set; }
    public decimal Rate { get; set; }
    public DateTime DeliveryDate { get; set; }
}

Moreover, I have a dynamic Linq expression string.

"ServiceRate!= null && Preference. Either (Carrier == Preference.Carrier)"

and I want to translate the aforementioned string into Dynamic LINQ like follows:

  var expression = System.Linq.Dynamic.DynamicExpression.ParseLambda<BestWayContext, bool>(condition, null).Compile();

But it displays the following error:

Please tell me what I'm doing incorrectly.