Email Activity Creation Problem

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  I m new in MS Dynamic CRM 2013. I m trying to make a email activity on the update of a issue (case). but I m getting error at:
  
   CreateResponse resp = (CreateResponse)slos.Execute(reqActivity);

  I m attaching the whole code here:

  
  

  // <copyright file="PostIssueUpdate.cs" company="">
  // Copyright (c) 2015 All Rights Reserved
  // </copyright>
  // <author></author>
  // <date>1/29/2015 2:37:35 PM</date>
  // <summary>Implements the PostIssueUpdate Plugin.</summary>
  // <auto-generated>
  //     This code was generated by a tool.
  //     Runtime Version:4.0.30319.1
  // </auto-generated>
  namespace CrmVSSolution1.Plugins
  {
      using System;
      using System.ServiceModel;
      using Microsoft.Xrm.Sdk;
      using System.ServiceModel.Description;
      using System.Text;
      using System.Collections.Generic;
      using System.Linq;
  
      // These namespaces are found in the Microsoft.Xrm.Sdk.dll assembly
      // found in the SDK\bin folder.
      using Microsoft.Xrm.Sdk.Query;
      using Microsoft.Xrm.Sdk.Discovery;
      using Microsoft.Xrm.Sdk.Messages;
      using Microsoft.Xrm.Sdk.Client;
      using Microsoft.Crm.Sdk.Messages;
      /// <summary>
      /// PostIssueUpdate Plugin.
      /// Fires when the following attributes are updated:
      /// All Attributes
      /// </summary>    
      public class PostIssueUpdate: Plugin
      {
          /// <summary>
          /// Initializes a new instance of the <see cref="PostIssueUpdate"/> class.
          /// </summary>
          public PostIssueUpdate()
              : base(typeof(PostIssueUpdate))
          {
              base.RegisteredEvents.Add(new Tuple<int, string, string, Action<LocalPluginContext>>(40, "Update", "incident", new Action<LocalPluginContext>(ExecutePostIssueUpdate)));
  
              // Note : you can register for more events here if this plugin is not specific to an individual entity and message combination.
              // You may also need to update your RegisterFile.crmregister plug-in registration file to reflect any change.
          }
  
          /// <summary>
          /// Executes the plug-in.
          /// </summary>
          /// <param name="localContext">The <see cref="LocalPluginContext"/> which contains the
          /// <see cref="IPluginExecutionContext"/>,
          /// <see cref="IOrganizationService"/>
          /// and <see cref="ITracingService"/>
          /// </param>
          /// <remarks>
          /// For improved performance, Microsoft Dynamics CRM caches plug-in instances.
          /// The plug-in's Execute method should be written to be stateless as the constructor
          /// is not called for every invocation of the plug-in. Also, multiple system threads
          /// could execute the plug-in at the same time. All per invocation state information
          /// is stored in the context. This means that you should not use global variables in plug-ins.
          /// </remarks>
          protected void ExecutePostIssueUpdate(LocalPluginContext localContext)
          {
              if (localContext == null)
              {
                  throw new ArgumentNullException("localContext");
              }
  
              // TODO: Implement your custom Plug-in business logic.
              IPluginExecutionContext context = localContext.PluginExecutionContext;
              IOrganizationService service = localContext.OrganizationService;
  
              if (context.InputParameters.Contains("Target") &&
               context.InputParameters["Target"] is Entity)
              {
                  // Obtain the target entity from the input parmameters.
                  Entity entity = (Entity)context.InputParameters["Target"];
                  if (entity.LogicalName == "incident")
                  {
                      string entityDescription = "There is no note found";
                      try
                      {
                          if (entity.Attributes.Contains(""))
                          {
  
                              entity.Attributes["description"] = entityDescription;
                          }
  
  
                          CreateRequest reqActivity = new CreateRequest();
                          Entity newEmail = new Entity("email");
                          newEmail["subject"] = "This is for testing";
                          newEmail["description"] = entityDescription;
                          Entity ap = new Entity();
                          Entity ap2 = new Entity();
                          ap = new Entity("activityparty");
                          ap["addressused"] = "xyz@xyz.com";
                          Entity[] aryTo = { ap };
                          newEmail["to"] = aryTo;
                          ap2 = new Entity("activityparty");
                          ap2["partyid"] = new EntityReference("systemuser", new Guid(""));
                          Entity[] aryFrom = { ap2 };
                          newEmail["from"] = aryFrom;
                          newEmail["regardingobjectid"] = new EntityReference("account", new Guid(""));
  
                          reqActivity.Target = newEmail;
                          CreateResponse resp = (CreateResponse)slos.Execute(reqActivity);
  
  
  
                      }
                      catch (FaultException ex)
                      {
                          throw new InvalidPluginExecutionException("An error occurred in the plug-in.", ex);
                      }
                  }
              }
          }
      }
  }
  

  
  

  Thursday, January 29, 2015 9:26 AM