need help with the template I can't figure out how to make horizontal and vertical lines

[GrigorevDanil]

I apologize immediately, I am writing with a translator. I have such classes:

public class GiveDetail : IEntity, IEquatable
{
public int Id { get; set; }
public Give Give { get; set; }
public Product Product { get; set; }
public int? CountProduct { get; set; }
public bool IsSelected { get; set; }

public bool Equals(GiveDetail other) => Id == other.Id;

}

public class Product : IEntity, IEquatable
{
public int Id { get; set; }
public Category Category { get; set; }
public Brand Brand { get; set; }
public Unit Unit { get; set; }
public string Title { get; set; }
public string Model { get; set; }
public int? CountProduct { get; set; }
public int? Price { get; set; }
public string OKPD { get; set; }
public string? Description { get; set; }
public string TextProduct { get { return Title + " " + Model; } }
public bool IsSelected { get; set; }

public bool Equals(Product other) => Id == other.Id;

}

public class Give : IEntity, IEquatable
{
public int Id { get; set; }
public Employee Employee { get; set; }
public DateTime? DateGive { get; set; }
public string StringDateGive { get { return DateGive?.ToString("dd.MM.yyyy"); } }
public string TextGive { get { return Employee.Name[0] + "." + Employee.Lastname[0] + ". " + Employee.Surname + " " + DateGive?.ToString("dd.MM.yyyy"); } }
public bool IsSelected { get; set; }

public bool Equals(Give other) => Id == other.Id;

}

public class Employee : IEntity, IEquatable
{
public int Id { get; set; }
public Department Department { get; set; }
public Post Post { get; set; }
public string Surname { get; set; }
public string Name { get; set; }
public string? Lastname { get; set; }
public string? Email { get; set; }
public string NumPhone { get; set; }
public string Address { get; set; }
public string TextEmployee { get { return Surname + " " + Name + " " + Lastname; } }

public bool IsSelected { get; set; }

public bool Equals(Employee other) => Id == other.Id;

}

Вот так я заполняю элемент объекта

public IEnumerable IncomingProducts => Model.PublicIncommingProducts;

(string fileName, string pathSave) = (DialogService.ShowInput("Введите название документа"), DialogService.ShowBrowserCatalog());
if (string.IsNullOrEmpty(fileName) || string.IsNullOrEmpty(pathSave)) return;

var data = new
{
Day = dateProvide.Day,
Month = dateProvide.ToString("MMMM"),
Year = dateProvide.ToString("yy"),
NumPage = 2,
Company = TextStructureName,
Department = SelectedDepartment.Title,
MaterialPerson = SelectedMaterialPerson.TextEmployee,
Items = IncomingProducts
};

using (var template = new XLTemplate(pathPattern))
{

 template.AddVariable(data);
 template.Generate();

 template.SaveAs(path + "\\" + nameDocument + ".xlsx");

}

I get this error

here is my template
PatternMaterialStatement.xlsx