ProgressBar and BackgroundWorker in C #

I'm creating an application with Firebird 2.5 in which I need it to read a .sql file with instructions to populate the database if these processes have not yet been done, because it is a bit long and because I do not know I want to add "não respondendo" to ProgressBar , but when I add them I'm now getting the following error while executing the commands: BackgroundWorker . Now if I run the application without using Connection must be valid and open and ProgressBar this error does not occur. This is the code I'm working on and the image on the screen is working, and it comes to an end without making a mistake. I've relied on this example of DevMedia: link

using System;
using System.Data;
using System.Windows.Forms;
using Engebuilder.Library;
using Engebuilder.UI.Windows.General;
using Engebuilder.UI;
using Engebuilder.Data;
using System.Reflection;
using System.Drawing;
using System.IO;
using System.Text.RegularExpressions;
using System.Threading;
using System.Text;

namespace GSD
{
    public partial class FomAux : Engebuilder.UI.Windows.General.DefaultForm
    {
        System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();

        public FomAux()
        {
            this.InitializeComponent();
            this.SetComponents(components);
        }

        private void FomAux_Load(object sender, System.EventArgs e)
        {
            timer.Interval = 10;
            timer.Enabled = true;
            timer.Tick += new EventHandler(Timer_Tick);
        }

        int contador = 0;

        private void Timer_Tick(object sender, System.EventArgs e)
        {
            try
            {
                contador += 1;

                if (contador >= 5)
                {
                    timer.Enabled = false;
                    contador = 0;

                    backgroundWorkerPopularBanco.RunWorkerAsync();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Ocorreu um erro inesperado: \"" + ex.Message + "\"", "Atenção!", MessageBoxButtons.OK, MessageBoxIcon.Information);

                this.Close();
            }
        }


        private void backgroundWorkerPopularBanco_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
        {
            try
            {
                string diretorio = Directory.GetCurrentDirectory();
                string filePath = Path.Combine(diretorio, "SCRIPT.sql");

                if (File.Exists(filePath))
                {
                    string populouBanco = Engebuilder.Library.LDataAccess.GetDataToString("SELECT CONFIG_SISTEMA.CONF_SIS_POPULOUBANCO FROM CONFIG_SISTEMA");

                    if (populouBanco.Trim().Equals("") || populouBanco.Trim().Equals("N"))
                    {
                        StreamReader leitor = new StreamReader(filePath, Encoding.UTF7);
                        string comteudoArq = leitor.ReadToEnd();

                        string[] comando = comteudoArq.Trim().Split(new Char[] { '!' });

                        Int64 contador = 0;

                        foreach (string valor in comando)
                        {
                            contador++;

                            if (!valor.Trim().Equals(""))
                            {
                                Engebuilder.Library.LDataAccess.ExecuteCommand(valor.Trim());

                                //faz a thread dormir por "p" milissegundos a cada passagem do loop
                                //Thread.Sleep(p);

                                listBox.BeginInvoke(
                                    new Action(() =>
                                    {
                                        listBox.Items.Add("[ " + DateTime.Now.ToString() + " ] - Processo: " + contador.ToString() + " comcluído.");
                                        listBox.SelectedIndex = listBox.Items.Count - 1;
                                    }
                                ));
                            }
                        }

                        string sqlConfig = "INSERT INTO CONFIG_SISTEMA (CONF_SIS_POPULOUBANCO, CONF_SIS_DATA, CONFI_SIS_LOG) "
                        + " VALUES('S', '" + DateTime.Now.ToString().Replace("/", ".") + "', NULL)";
                        Engebuilder.Library.LDataAccess.ExecuteCommand(sqlConfig.Trim());

                        DialogResult result = MessageBox.Show("Configurações Concluídas com Sucesso!", "Atenção!", MessageBoxButtons.OK, MessageBoxIcon.Information);

                        if (result.Equals(DialogResult.OK))
                            this.Close();
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show("Ocoreu um erro Realizar algumas Configurações: \"" + ex.Message + "\"", "Atenção!", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }

        private void backgroundWorkerPopularBanco_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e)
        {
            //Caso cancelado...
            if (e.Cancelled)
            {
                // reconfigura a progressbar para o padrao.
                ProgressBarPopularBanco.MarqueeAnimationSpeed = 0;
                ProgressBarPopularBanco.Style = ProgressBarStyle.Blocks;
                ProgressBarPopularBanco.Value = 0;

                //caso a operação seja cancelada, informa ao usuario.
                listBox.Items.Add("[ " + DateTime.Now.ToString() + " ] - Operação Cancelada pelo Usuário!");

                //limpa a label
                label1.Text = string.Empty;
            }
            else if (e.Error != null)
            {
                //informa ao usuario do acontecimento de algum erro.
                listBox.Items.Add("[ " + DateTime.Now.ToString() + " ] - Aconteceu um erro durante a execução do processo!");
                // reconfigura a progressbar para o padrao.
                ProgressBarPopularBanco.MarqueeAnimationSpeed = 0;
                ProgressBarPopularBanco.Style = ProgressBarStyle.Blocks;
                ProgressBarPopularBanco.Value = 0;
            }
            else
            {
                //informa que a tarefa foi concluida com sucesso.
                listBox.Items.Add("[ " + DateTime.Now.ToString() + " ] - Processos Concluidos com Sucesso!");
                //Carrega todo progressbar.
                ProgressBarPopularBanco.MarqueeAnimationSpeed = 0;
                ProgressBarPopularBanco.Style = ProgressBarStyle.Blocks;
                ProgressBarPopularBanco.Value = 100;
                label1.Text = ProgressBarPopularBanco.Value.ToString() + "%";
            }
        }
    }
}