I am what you call a "n00b" in CRM plugin development. I am trying to write a plugin for Microsoft's Dynamics CRM 2011 that will create a new activity entity when you create a new contact. I want this activity entity to be associated with the contact entity.

This is my current code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xrm.Sdk;

namespace ITPH_CRM_Deactivate_Account_SSP_Disable
{
    public class SSPDisable_Plugin: IPlugin
    {

        public void Execute(IServiceProvider serviceProvider)
        {

            // Obtain the execution context from the service provider.
            IPluginExecutionContext context = (IPluginExecutionContext)
                serviceProvider.GetService(typeof(IPluginExecutionContext));

            IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
            IOrganizationService service = serviceFactory.CreateOrganizationService(context.UserId);

            if (context.InputParameters.Contains("Target") && context.InputParameters["target"] is Entity)
            {
                Entity entity = context.InputParameters["Target"] as Entity;

            if (entity.LogicalName != "account")
            {
                return;
            }

            Entity followup = new Entity();
            followup.LogicalName = "activitypointer";
            followup.Attributes = new AttributeCollection();
            followup.Attributes.Add("subject", "Created via Plugin.");
            followup.Attributes.Add("description", "This is generated by the magic of C# ...");
            followup.Attributes.Add("scheduledstart", DateTime.Now.AddDays(3));
            followup.Attributes.Add("actualend", DateTime.Now.AddDays(5));

            if (context.OutputParameters.Contains("id"))
            {
                Guid regardingobjectid = new Guid(context.OutputParameters["id"].ToString());
                string regardingobjectidType = "account";

                followup["regardingobjectid"] = new EntityReference(regardingobjectidType, regardingobjectid);

            }

            service.Create(followup);

        }


    }

}

But when i try to run this code: I get an error when i try to create a new contact in the CRM environment. The error is: "The given key was not present in the dictionary" (Link *1). The error pops up right as i try to save the new contact.

Link *1: http://puu.sh/4SXrW.png (Translated bold text: "Error on business process")

Thanks for any help or suggestions :)