QueryExpression error, “The formatter threw an exception while trying to deserialize the message” using LINQ

I'm attempting to understand some of the differences between Dynamics LINQ and Entity Framework LINQ.  I've generated the strongly typed classes and a context using the CrmSvcUtil.exe utility.  This sample code throws the following exception:

using System.Configuration;
using System.Linq;
using CrmEntities;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Tooling.Connector;

namespace ConsoleConnectToCrm
{    public static class CrmLinqTest    {        private static readonly string _connectionStringName = "PORTR2015";        private static IOrganizationService _orgService;        public static void Run()        {            var crmServiceClient = new CrmServiceClient(ConfigurationManager.ConnectionStrings[_connectionStringName].ConnectionString);            _orgService = (IOrganizationService)crmServiceClient.OrganizationWebProxyClient != null                              ? (IOrganizationService)crmServiceClient.OrganizationWebProxyClient                              : (IOrganizationService)crmServiceClient.OrganizationServiceProxy;            var crmCtx = new CrmEntities.CrmLinqContext(_orgService);            //Add a new account            var newAccount = new Account()                             {                                 Name = "Linq Coffee Shop",                                 NumberOfEmployees = 12,                                 AccountCategoryCode = new OptionSetValue(1),                                 CreditLimit = new Money(12000)                             };            crmCtx.AddObject(newAccount);            var saveResults = crmCtx.SaveChanges();            //Retrieve the newly added account            var retAccount = crmCtx.AccountSet.FirstOrDefault(x => x.Id == newAccount.Id);            retAccount.CreditLimit = new Money(15000);            //Update the changes back to the context            crmCtx.UpdateObject(retAccount);            saveResults = crmCtx.SaveChanges();        }    }
}

This exception is thrown when the final SaveChanges() tries to run.

"The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter schemas.microsoft.com/.../Services:request. The InnerException message was 'Error in line 1 position 13160. Element 'schemas.datacontract.org/.../System.Collections.Generic:value' contains data from a type that maps to the name 'schemas.microsoft.com/.../Contracts:ConcurrencyBehavior'. The deserializer has no knowledge of any type that maps to this name. Consider changing the implementation of the ResolveName method on your DataContractResolver to return a non-null value for name 'ConcurrencyBehavior' and namespace 'schemas.microsoft.com/.../Contracts'.'.  Please see InnerException for more details."