Can't parse the XML to insert to dataGridView

Use my previous posting code. Added MakeDataTable. Than you can make the DataSource of dgv the datatable : datagridview1.DataSource = dt.

 public class Simulator
    {
        XDocument doc = null;
        public Simulator(string filename)
        {
            doc = XDocument.Load(filename);
        }
        public Simulator(string id, string description)
        {
            string ident = "<?xml version=\"1.0\" encoding=\"utf-8\"?><Simulator></Simulator>";
            doc = XDocument.Parse(ident);
            XElement flight = new XElement("Flight", new object[] {
                new XAttribute("ID", id),
                new XAttribute("Description", description)
            });

            doc.Root.Add(flight);
        }
        public string AddUser(string flightID, string role, string number, string name, string surname, string rank)
        {
            XElement flight = doc.Descendants("Flight").Where(x => (string)x.Attribute("ID") == flightID).FirstOrDefault();

            if (flight != null)
            {
                XElement user = new XElement(role, new object[] {
                    new XAttribute("Num", number),
                    new XElement("Name", name),
                    new XElement ("Surname", surname),
                    new XElement("Rank", rank)
                });
                flight.Add(user);
                return "GOOD";
            }
            else
            {
                return "Flight ID doesn't exist";
            }
        }
        public string AddFlight(string flightID, string description)
        {
            XElement flight = doc.Descendants("Flight").Where(x => (string)x.Attribute("ID") == flightID).FirstOrDefault();
            if (flight == null)
            {
                flight = new XElement("Flight", new object[] {
                    new XAttribute("ID", flightID),
                    new XAttribute("Description", description)
                });
                doc.Root.Add(flight);
                return "Good";
            }
            else
            {
                return "Flight ID already exists";
            }
        }
        public string AddErrors(string flightID, XElement errorLog)
        {
            XElement flight = doc.Descendants("Flight").Where(x => (string)x.Attribute("ID") == flightID).FirstOrDefault();
            if (flight == null)
            {
                return "Flight ID doesn't exist";
            }
            else
            {
                flight.Add(errorLog);
                return "GOOD";
            }

        }
        public void WriteXml(string filename)
        {
            doc.Save(filename);
        }
        public DataTable MakeDataTable()
        {
            DataTable dt = new DataTable();
            dt.Columns.Add("flight_id", typeof(int));
            dt.Columns.Add("flight_description", typeof(string));
            dt.Columns.Add("flight_date",typeof(DateTime));
            dt.Columns.Add("instructor_num", typeof(int));
            dt.Columns.Add("instructor_name", typeof(string));
            dt.Columns.Add("student_num", typeof(int));
            dt.Columns.Add("student_name", typeof(string));

            foreach (XElement flight in doc.Descendants("Flight"))
            {
                DataRow row = dt.Rows.Add();

                int iD = (int)flight.Attribute("ID");
                row["flight_id"] = iD;
                string description = (string)flight.Attribute("Description");
                row["flight_description"] = description;
                DateTime date = (DateTime)flight.Attribute("Date");
                row["flight_date"] = date;

                XElement xStudent = flight.Element("Student");
                if (xStudent != null)
                {
                    int studentNum = (int)xStudent.Attribute("Num");
                    row["student_num"] = studentNum;
                    string studentName = (string)xStudent.Element("Name");
                    row["student_name"] = studentName;
                }

                XElement xInstructor = flight.Element("Instructor");
                if (xInstructor != null)
                {
                    int instructorNum = (int)xStudent.Attribute("Num");
                    row["instructor_num"] = instructorNum;
                    string instructorName = (string)xStudent.Element("Name");
                    row["student_name"] = instructorName;
                }
            }
            return dt;

        }
    }

Try to create classes for the simulator and deserialize it like this

   public Simulator FromXml(string value)
   {
        using (TextReader reader = new StringReader(value))
        {
           return new XmlSerializer(Simulator).Deserialize(reader);
        }
    }


public partial class Simulator
{
    [JsonProperty("Flight")]
    public Flight Flight { get; set; }
}

public partial class Flight
{
    [JsonProperty("Instructor")]
    public Instructor Instructor { get; set; }

    [JsonProperty("Student")]
    public Instructor Student { get; set; }

    [JsonProperty("Operator")]
    public Instructor Operator { get; set; }

    [JsonProperty("Technician")]
    public Instructor Technician { get; set; }

    [JsonProperty("ErrorLOGS")]
    public ErrorLogs ErrorLogs { get; set; }
}

public partial class ErrorLogs
{
    [JsonProperty("Logs")]
    public Log[] Logs { get; set; }
}

public partial class Log
{
    [JsonProperty("ErrorGUI")]
    public string ErrorGui { get; set; }

    [JsonProperty("ErrorType")]
    public string ErrorType { get; set; }

    [JsonProperty("ProgramPage")]
    public string ProgramPage { get; set; }

    [JsonProperty("ErrorStartTime")]
    public string ErrorStartTime { get; set; }
}

public partial class Instructor
{
    [JsonProperty("Name")]
    public string Name { get; set; }

    [JsonProperty("Surname")]
    public string Surname { get; set; }

    [JsonProperty("Rank")]
    public string Rank { get; set; }
}

private void gridFilter_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex > -1 && e.ColumnIndex > -1)
            {
                gridFilter.Rows[e.RowIndex].Selected = true;
                string selectedValue = gridFilter.Rows[e.RowIndex].Cells[0].FormattedValue.ToString();
                XDocument doc = XDocument.Load(inputpath);
                List<XElement> flights = doc.Descendants("Flight").ToList();
                foreach (XElement flight in flights)
                {
                    string idSelect1 = (string)flight.Attribute("ID");
                    if (selectedValue == idSelect1) {
                        XElement xLogs = flight.Element("Logs");
                        if (xLogs != null)
                        {
                            string ErrorGUI = (string)xLogs.Element("ErrorGUI");
                            string ErrorType = (string)xLogs.Element("ErrorType");
                            string ProgramPage = (string)xLogs.Element("ProgramPage");
                            listBox.Items.Add(ErrorGUI);
                            listBox.Items.Add(ErrorType);
                            listBox.Items.Add(ProgramPage);
   
                        }                           
                    }
                }
            }
        }