creating Email getting error :

Hi Team

Below is the code. I have written for email creation by late binding:

Entity[] toArray = new Entity[to.Entities.Count()];
                var count = 0;
                foreach (var item in to.Entities)
                {
                    Entity emailToEntity = new Entity(Email.ActivityParty);
                    emailToEntity["partyid"] = new EntityReference(Email.Systemuser, item.Id);
                    toArray[count] = emailToEntity;
                    count++;

                }

                //Entity emailFromEntity = new Entity(Email.ActivityParty);
                //emailFromEntity["partyid"] = new EntityReference("queue", from);

                Entity[] ent = new Entity[1];
                ent[0] = new Entity(Email.ActivityParty);
                ent[0].Attributes["partyid"] = new EntityReference("queue", from);

                Entity entity = new Entity(Email.SchemaName);
                entity[Email.From] = ent;// new Entity[] { emailFromEntity };
                entity[Email.To] = toArray; //new Entity[] { emailToEntity };
                entity[Email.Subject] = subject;
                entity[Email.Description] = bodyText;
                entity[Email.Owner] = new EntityReference(Email.Systemuser, ownerId);
                entity[Email.RegObjId] = "model id";
                Guid emailid = organizationproxy.Create(entity);

The Below Error I am getting.:

systemuser With Id = fa0c6845-b439-e411-9d0b-005056ba9f90 Does Not Exist. the Guid is a QueueID

please Help me..

Thanks 

Naveen 

Naveen