Created Unassigned: Example files : UseBasicFormulaInXlsx Error [13616]

There is a problem in the examples files the code once referenced, doesn't create the spreadsheet as expected. I've changed to to this, so simply replace and you'll be up and running.

/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
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http://www.apache.org/licenses/LICENSE-2.0

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limitations under the License.
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/* ================================================================
* Author: Tony Qu
* Author's email: tonyqus (at) gmail.com
* NPOI HomePage: http://www.codeplex.com/npoi
* Contributors:
*
* ==============================================================*/

using System;
using System.Text;
using System.IO;
using NPOI.HSSF.UserModel;
using NPOI.HPSF;
using NPOI.POIFS.FileSystem;
using NPOI.SS.UserModel;


namespace UseBasicFormulaInXlsx
{
class Program
{
static void Main(string[] args)
{
//IWorkbook workbook = new HSSFWorkbook();
hssfworkbook = new HSSFWorkbook();//Fizban64 Mod
ISheet s1 = hssfworkbook.CreateSheet("Sheet1");//Fizban64 Mod
//set A2
s1.CreateRow(1).CreateCell(0).SetCellValue(-5);
//set B2
s1.GetRow(1).CreateCell(1).SetCellValue(1111);
//set C2
s1.GetRow(1).CreateCell(2).SetCellValue(7.623);
//set A3
s1.CreateRow(2).CreateCell(0).SetCellValue(2.2);

//set A4=A2+A3
s1.CreateRow(3).CreateCell(0).CellFormula = "A2+A3";
//set D2=SUM(A2:C2);
s1.GetRow(1).CreateCell(3).CellFormula = "SUM(A2:C2)";
//set A5=cos(5)+sin(10)
s1.CreateRow(4).CreateCell(0).CellFormula="cos(5)+sin(10)";


//create another sheet
ISheet s2 = hssfworkbook.CreateSheet("Sheet2");//Fizban64 Mod
//set cross-sheet reference
s2.CreateRow(0).CreateCell(0).CellFormula = "Sheet1!A2+Sheet1!A3";
IFormulaEvaluator e = WorkbookFactory.CreateFormulaEvaluator(hssfworkbook);
ICell ic = s2.GetRow(0).GetCell(0);//Fizban64 Mod
var cell = e.Evaluate(ic);//Fizban64 Mod
WriteToFile();
}


static HSSFWorkbook hssfworkbook;

static void WriteToFile()
{
//Write the stream data of workbook to the root directory
FileStream file = new FileStream(@"test.xls", FileMode.Create);//Fizban64 Mod renames to xls
hssfworkbook.Write(file);//Fizban64 Mod
file.Flush();//Fizban64 Mod
file.Close();
}

}
}