Object reference not set to an instance of an object.

Hi All,

I'm fairly new on CRM I'm trying to insert records using IOrganization Service and I'm getting the error - Object reference not set to an instance of an object. look at my code below:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Query;
using Microsoft.Xrm.Sdk.Client;
using Microsoft.Crm.Sdk.Messages;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.Xrm.Client;
using Microsoft.Xrm.Client.Services;
using Microsoft.Xrm.Tooling.Connector;
using NUnit.Framework;
using System.Configuration.Assemblies;
using System.ServiceModel.Description;

namespace JSE_CRM_MDS_Integration_Automation1
{
    public class CRM
    {

        private OrganizationServiceProxy _serviceProxy;
        private IOrganizationService _orgService;

        // Define the IDs needed for this sample.
        private Guid _accountId;

        public static void Main(string[] args)
        {
            CRM crm = new CRM();
            crm.Run();

        }
       
        public void Run()
        {
            //try
            //{
            string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["MyCRMServer"].ConnectionString;
            string strOrganizationUri = System.Configuration.ConfigurationManager.AppSettings["MyUrI"];
            var credentials = new ClientCredentials();
            credentials.UserName.UserName = System.Configuration.ConfigurationManager.AppSettings["UserName"];
            credentials.UserName.Password = System.Configuration.ConfigurationManager.AppSettings["Password"];
            var organizationUriIFD = new Uri(strOrganizationUri);
            //In-case I have organization service issue being null
            System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;
            //Use the connection string named "MyCRMServer from the configuration file "  
            CrmServiceClient crmSvc = new CrmServiceClient(System.Configuration.ConfigurationManager.ConnectionStrings["MyCRMServer"].ConnectionString);
            Console.WriteLine("Connection String Found on App.Config!!");
            //Wrapping connString to the CrmServiceClient Object
            CrmServiceClient conn = new Microsoft.Xrm.Tooling.Connector.CrmServiceClient(connectionString);
            _orgService = crmSvc.OrganizationWebProxyClient != null ? crmSvc.OrganizationWebProxyClient(IOrganizationService)crmSvc.OrganizationServiceProxy;
            _orgService = (IOrganizationService)conn.OrganizationWebProxyClient != null ? (IOrganizationService)conn.OrganizationWebProxyClient : (IOrganizationService)conn.OrganizationServiceProxy;
            Console.WriteLine("Succesfully Connected to the IOrganization Service!!");
            CreateRequiredRecords();
         
            Entity account = new Entity("account");
            account.Attributes["AccountId"] = "141da83-3ee7-e811-80f3-005056b546bz";
            account.Attributes["RoleTypeId"] = "2";
            account.Attributes["RoleStatusId"] = "2";
            // Create an account record named account.
        _accountId = _orgService.Create(account);
 
            Console.Write(_accountId);
            //Console.WriteLine("{0} {1} {2} created,", account.LogicalName);
            Console.Write("Account created succesfully");

            //}
            //catch (Exception err)
            //{
            //err.ToString();
            //}
        }