dynamic type and .net Remoting

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.NET4

Hi,
I'm working with the new dynaic type in .Net 4.0 . I try to send an object with .net Remoting without knowing his type using Reflection.
Here's the snippet of my remoting Client

Assembly ass = Assembly.LoadFile(assemblyPath);
dynamic crm =  ass.CreateInstance("CrmDll.CrmTiersFactory");
dynamic client = crm.getCrmClient(companyId);
TcpChannel tcp = new TcpChannel();
ChannelServices.RegisterChannel(tcp, false);
string url = "ServerUrl";
TypeConverter tc = TypeDescriptor.GetConverter(ass.GetType("CrmDll.IRemoteOperation"));
dynamic remoteOperation = tc.ConvertFrom( Activator.GetObject
                (
                ass.GetType("CrmDll.IRemoteOperation")
                , url
                ));

The interface IRemoteOperation used in Remoting is in the loaded Dll.
for the last line of snippet, I'v got the following NotSupportedException
can't convert from System.MarshalByRefObject with ReferenceConverter
Any idea ????
thanks