IRecurringEvolutionJobPlugin Schedule Not Saving

I have a simple job that runs on a schedule.  When I try update the schedule in the control panel, the screen goes white and it doesn't save.  I seem to recall I need to implement another Interface member, but can't recall what it is.

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using Telligent.DynamicConfiguration.Components;
using Telligent.Evolution.Extensibility.Api.Version1;
using Telligent.Evolution.Extensibility.Jobs.Version1;
using Telligent.Evolution.Extensibility.Version1;
using Telligent.Jobs;

namespace HearingFirst.MailChimp
{
    public class ListReconcilerJob : IPlugin, IRecurringEvolutionJobPlugin
    {
        #region Private Members
        private const int _pageSize = 100;
        private Guid _jobTypeId = Guid.Parse("A1D76532-D53C-4E35-BC87-2EDBB835227B");
        #endregion

        #region IPlugin
        public string Description
        {
            get
            {
                return "The Description";
            }
        }

        public string Name
        {
            get
            {
                return "MailChimp ";
            }
        }

        public void Initialize()
        {
            
        }
        #endregion

        #region IJob
        public void Execute(JobData jobData)
        {
            
        }
        public Guid JobTypeId
        {
            get
            {
                return this._jobTypeId;
            }
        }

        public JobSchedule DefaultSchedule
        {
            get
            {
                return JobSchedule.EveryMinutes(60);
            }
        }

        public JobContext SupportedContext
        {
            get
            {
                return JobContext.Service; 
            }
        }
        #endregion


    }
}