Automapper Map with Anonymous function not working in version 2.0

AutomapperMappingSetup.cs

using System.Linq;
using AutoMapper;

public static class AutoMapperConfig
{
    public static void CreateMappings()
    {
       Mapper.CreateMap<User, ConfigurationUserViewModel>()
                 .ForMember(dest => dest.Email, opt => opt.MapFrom(src => 
                 {
                     var email = src.ContactMechanisms.SingleOrDefault(cm => cm.ContactMechanismTypeId == ContactMechanismType.EMAIL && cm.IsPreferred == true);
                     return email == null ? string.Empty : email.Data;
                 }));

    }
}