Getting this error

I am trying to build an email in a custom workflow activity in CRM 2011

However when I run the workflow I get this error message:

System.ServiceModel.FaultException`1[Microsoft.Xrm.Sdk.OrganizationServiceFault]: Cannot create activity party: either partyid or addressused field should be present (Fault Detail is equal to Microsoft.Xrm.Sdk.OrganizationServiceFault).

My code is below:

using System;
using System.IO;
using System.Text;
using System.ServiceModel;
using System.ServiceModel.Description;
using System.Xml.Serialization;
using System.Activities;
using System.Collections.Generic;
using System.Linq;
using System.Diagnostics;
using System.Threading.Tasks;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Query;
using Microsoft.Xrm.Sdk.Client;
using Microsoft.Xrm.Sdk.Discovery;
using Microsoft.Xrm.Sdk.Messages;
using Microsoft.Xrm.Sdk.Workflow;
using Microsoft.Crm.Sdk;
using Microsoft.Crm.Sdk.Messages;
using System.Globalization;
using System.Net;
using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Web.Services.Protocols;

namespace AutoSubmitOrderEmail
{
    public class SendEmail : CodeActivity
    {
        protected override void Execute(CodeActivityContext executionContext)
        {
            try
            {
                //Create the IWorkflowContext and the IOrganizationService for communication with CRM
                // Create the tracing service
                //ITracingService tracingService = executionContext.GetExtension<ITracingService>();
                IWorkflowContext context = executionContext.GetExtension<IWorkflowContext>();
                IOrganizationServiceFactory serviceFactory = executionContext.GetExtension<IOrganizationServiceFactory>();
                IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);

                // Get the target entity from the context
                //Entity target = (Entity)context.InputParameters["Target"];
                EntityReference quote = myQuote.Get<EntityReference>(executionContext);

                // Access the input parameter declared above 
                Guid QuoteId = new Guid();
                QuoteId = myQuote.Get(executionContext).Id;

                Write("TEST_1 QuoteId=" + QuoteId.ToString());

                // Access the input parameter declared above 
                Guid CustomerPrimaryContact = Guid.Empty;

                Guid AEId = new Guid();
                AEId = myQuote.Get(executionContext).Id;

                Write("TEST_2 AEId=" + AEId.ToString());

                Guid CSEId = new Guid();
                CSEId = myQuote.Get(executionContext).Id;

                Write("TEST_3 CSEId=" + CSEId.ToString());

                Guid IAMId = new Guid();
                IAMId = myQuote.Get(executionContext).Id;

                Write("TEST_4 IAMId=" + IAMId.ToString());

                try
                {
                    //Execute Stored Proc
                    using (SqlConnection oConn = new SqlConnection(connectionString))
                    {
                        oConn.Open();
                        //Delete Commit link SQL statement
                        using (SqlCommand cmd = new SqlCommand())
                        {
                            cmd.Connection = oConn;
                            cmd.CommandType = CommandType.StoredProcedure;
                            cmd.CommandText = "<storedproc here>";
                            cmd.Parameters.AddWithValue("@QuoteId", QuoteId);
                            using (SqlDataReader reader = cmd.ExecuteReader())
                            {
                                if (reader != null)
                                {
                                    int intCounter = 0;
                                    while (reader.Read())
                                    {
                                        if (intCounter == 0)
                                        {
                                            GPOrderNumber = reader["GTRI_GPOrderNumber"].ToString();
                                            CustomerIdName = reader["CustomerIdName"].ToString();
                                            CustomerPrimaryContact = (Guid)reader["GTRI_CustomerPrimaryContactId"];
                                            ConfirmationContact1 = reader["gtri_ConfirmationContact1"].ToString();
                                            ConfirmationContact2 = reader["gtri_ConfirmationContact2"].ToString();
                                            ConfirmationContact3 = reader["gtri_ConfirmationContact3"].ToString();
                                        }
                                        intCounter++; //end of rea
                                    }
                                    reader.Close();
                                }
                            }
                        }
                        oConn.Close();
                    }
                }
                catch (Exception ex)
                {
                    Write(ex);
                }
                //From user crm 
                //Create Email
                Entity email = new Entity("email");

                //Build From: email
                Entity fromParty = new Entity("activityparty");
                fromParty.Attributes.Add("partyid", new EntityReference("quote", IAMId));

                Write("TEST_6 fromParty=" + fromParty.ToString());

                //Buid To: email 
                //Create the "TO:" activity party for the email
                Entity toParty = new Entity("activityparty");
                toParty["partyid1"] = new EntityReference("quote", CustomerPrimaryContact);
                //toParty["partyid3"] = new EntityReference("quote", toPartyEmailConfirmationContact1);
                //toParty["partyid4"] = new EntityReference("quote", toPartyEmailConfirmationContact2);
                //toParty["partyid5"] = new EntityReference("quote", toPartyEmailConfirmationContact3);

                Write("TEST_7 toParty=" + toParty.ToString() + CustomerPrimaryContact.ToString());

                //Build CC: email
                Entity ccParty = new Entity("activityparty");
                ccParty["partyid1"] = new EntityReference("quote", AEId);
                ccParty["partyid2"] = new EntityReference("quote", CSEId);

                Write("TEST_8 ccParty=" + ccParty.ToString());

                //Build Body: email
                //String emailBody = TextBody.Get<String>(executionContext);
                //emailBody["partyid1"] = new EntityReference("quote", QuoteNumber);

                //Build Email: email
                email["from"] = new Entity[] { fromParty };
                email["to"] = new Entity[] { toParty };
                email["cc"] = new Entity[] { ccParty };
                email["regardingobjectid"] = new EntityReference("quote", quote.Id);
                email["directioncode"] = true;
                email["subject"] = "Your order has been placed.";
                //Build body: email
                //email["body"] = "Quote: " + QuoteNumber;
                //email["body"] = "Est. Ship Date: " + EstShipDate;
                //email["body"] = "GTRI Order Number: " + GTRINumber;
                //email["body"] = "GP Order Number : " + GPOrderNumber;
                //email["body"] = "GTRI Number: " + GTRINumber;
                //email["body"] = "Serial Number: " + SerialNumber;
                //email["body"] = "Tracking Number: " + TrackingNumbers;
                //email["body"] = "Maintenance Number: " + MaintenanceNumber;
                //email["body"] = "Purchase Order: " + PurchaseOrderId;

                //Write("TEST_9 EmailBody=" + QuoteNumber.ToString() + EstShipDate.ToString() + GTRINumber.ToString() + GPOrderNumber.ToString() + GTRINumber.ToString()
                //    + SerialNumber.ToString() + TrackingNumbers.ToString() + MaintenanceNumber.ToString() + PurchaseOrderId.ToString());
                Guid emailId = service.Create(email);

                //Send email
SendEmailRequestreqSendEmail = newSendEmailRequest();
                reqSendEmail.EmailId = emailId; 
//ID of created mail
                reqSendEmail.TrackingToken = "";
                reqSendEmail.IssueSend = 
true;
SendEmailResponseres = (SendEmailResponse)service.Execute(reqSendEmail)
            }
            catch(Exception ex)
            {
                Write(ex);
            }
        }
        #region CRMInput
        // Initialize the input parameter
        [Input("Purchase Order")]
        [ReferenceTarget("gtri_purchaseorder")]
        public InArgument<EntityReference> purchaseOrderReference { get; set; }

        // Initialize the input parameter
        [Input("Account Executive")]
        [ReferenceTarget("systemuser")]
        public InArgument<EntityReference> accountExecutiveReference { get; set; }

        [Input("Text Body")]
        public InArgument<string> TextBody { get; set; }

        [Input("Quote")]
        [ReferenceTarget("quote")]
        public InArgument<EntityReference> myQuote { get; set; }
        #endregion
    }
}

newjeep