Why data validation list throws argument out of range exception in XlsIO?

using Syncfusion.XlsIO;
using System.IO;
using System.Reflection;
 
namespace XlsIO_Sample
{
    class Program
    {
        public static void Main(string[] args)
        {
            //Instantiate the spreadsheet creation engine
            using (ExcelEngine excelEngine = new ExcelEngine())
            {
                IApplication application = excelEngine.Excel;
                IWorkbook workbook = application.Workbooks.Create(1);
 
                IWorksheet worksheet = workbook.Worksheets[0];
 
                worksheet["A1"].Text = "Select Country";
 
                worksheet["B1"].CellStyle.ColorIndex = ExcelKnownColors.Grey_25_percent;
 
                //Adding data validation to the cell "B1"
                IDataValidation validation = worksheet["B1"].DataValidation;
 
                //Giving values to the data validation list directly. If one more character added, it will throw exception.
                validation.ListOfValues = new string[] { "Albania","Australia","Austria","Belgium","Bolivia","Canada","Chile","China","Colombia","Congo","Dubai","Egypt","England","Finland","France","Georgia","Germany","Greece","Haiti","India","Indonesia","Ireland","Japan","Malaysia","North Korea","Singapore","South Africa","South Korea","Sri Lanka","United States","Yemen"};
 
                //Save and close the workbook
                Stream stream = File.Create("Output.xlsx");
                worksheet.UsedRange.AutofitColumns();
                workbook.SaveAs(stream);
            }
        }
    }
}
 

Imports Syncfusion.XlsIO
Imports System.IO
Imports System.Reflection
 
Namespace XlsIO_Sample
 
    Class Program
 
        Public Shared Sub Main(ByVal args As String())
 
            'Instantiate the spreadsheet creation engine
            Using excelEngine As ExcelEngine = New ExcelEngine()
 
                Dim application As IApplication = excelEngine.Excel
                Dim workbook As IWorkbook = application.Workbooks.Create(1)
                Dim worksheet As IWorksheet = workbook.Worksheets(0)
 
                worksheet("A1").Text = "Select Country"
 
                worksheet("B1").CellStyle.ColorIndex = ExcelKnownColors.Grey_25_percent
 
                'Adding data validation to the cell "B1"
                Dim validation As IDataValidation = worksheet("B1").DataValidation
 
                'Giving values to the data validation list directly.If one more character added, it will throw exception.
                validation.ListOfValues = New String() {"Albania", "Australia", "Austria", "Belgium", "Bolivia", "Canada", "Chile", "China", "Colombia", "Congo", "Dubai", "Egypt", "England", "Finland", "France", "Georgia", "Germany", "Greece", "Haiti", "India", "Indonesia", "Ireland", "Japan", "Malaysia", "North Korea", "Singapore", "South Africa", "South Korea", "Sri Lanka", "United States", "Yemen"}
 
                'Save and close the workbook
                Dim stream As Stream = File.Create("Output.xlsx")
                worksheet.UsedRange.AutofitColumns()
                workbook.SaveAs(stream)
            End Using
        End Sub
    End Class
End Namespace