[nhusers] Error : "could not set a property value by reflection setter of ..."

[Jeffrey Becker]

I'm getting an error about "could not set a property value by reflection 
setter of GpisReplacement.Domain.Phase.Id" when I go to commit a 
transaction.  I've double-checked and that class has a public setter for 
that property.  I've also double-checked that all my classes have a public 
or protected default constructor per a stack-overflow post I found. Are 
there any other things that could cause this error?  Relevant files are 
attached.

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Phase.hbm.xml
Description: XML document

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using GpisReplacement.Arch;
using GpisReplacement.Domain.Enums;

namespace GpisReplacement.Domain
{
    public class Phase 
    {
        public Phase()
        {
            Contacts = new HashSet<PhaseContact>();
            Districts = new HashSet<District>();
            PhaseLocations = new HashSet<ProjectLocation>();

        }
        public virtual long Id { get; set; }
        public virtual Project Project { get; set; }
        public virtual PhaseName PhaseName { get; set; }
        [Display(Name = "Estimated Start")]
        public virtual DateTime? EstStartDate { get; set; }
        [Display(Name = "Estimated End")]
        public virtual DateTime? EstEndDate { get; set; }
        [Display(Name = "Actual Start")]
        public virtual DateTime? ActStartDate { get; set; }
        [Display(Name = "Actual End")]
        public virtual DateTime? ActEndDate { get; set; }
        public virtual bool IsCurrentPhase { get; set; }

        
        public virtual ICollection<ProjectLocation> PhaseLocations { get; set; }
        public virtual ICollection<PhaseContact> Contacts { get; set; }
        public virtual ICollection<District> Districts { get; set; }

        public virtual DateTime StartDate { get; protected set; }
        public virtual DateTime EndDate { get; protected set; }

        public virtual void AddLocation(ProjectLocation clone)
        {
            clone.Phase = this;
            clone.Project = this.Project;
            this.PhaseLocations.Add(clone);
            
        }

        //public virtual void AddContact(Contact contact)
        //{
        //    if (!Contacts.Contains(contact))
        //    {
        //        this.Contacts.Add(contact);
        //    }
            
        //}

        public virtual void AddDistrict(District district)
        {
            if (!this.Districts.Contains(district))
            {
                this.Districts.Add(district);
            }
            if (!district.Phases.Contains(this))
            {
                district.Phases.Add(this);
            }
        }

        public virtual Project GetProject()
        {
            return this.Project;
        }
        /// <summary>
        /// Gets a list of PAOneCalls for all locations for this phase.  
        /// </summary>
        /// <returns>Only distinct number/type combinations are returned.</returns>
        public virtual IEnumerable<LocationPAOneCall> GetPhaseDistinctPaOneCalls()
        {
            var l = new List<LocationPAOneCall>();
            foreach (var projectLocation in PhaseLocations)
            {
                if (projectLocation.PAOneCallNumbers == null || !projectLocation.PAOneCallNumbers.Any()) continue;
                foreach (var oneCall in projectLocation.PAOneCallNumbers)
                {
                    //looking for new number/type combo
                    if (!l.Exists(call => call.Number == oneCall.Number && call.OneCallType == oneCall.OneCallType))
                    {
                        l.Add(oneCall);
                    }
                }
            }
            return l;
        }

        public virtual void AddContact(Contact contact, bool isPrimary)
        {
            if(contact == null) throw new ArgumentNullException("contact");
            var pcm = new PhaseContact
            {
                //Project = Project,
                Phase = this,
                Contact = contact
            };
            contact.ProjectPhases.Add(pcm);
            Contacts.Add(pcm);
        }

        public virtual void RemoveContact(Contact contact)
        {
            if (contact == null) throw new ArgumentNullException("contact");
            var pcm = Contacts.First(c => c.Contact.Id == contact.Id);
            contact.ProjectPhases.Remove(pcm);
            Contacts.Remove(pcm);
        }
    }
}