Created Unassigned: EvaluateAllFormulaCells error [13992]

Im' using the version 2.3.1 and when I call the HSSFFormulaEvaluator.EvaluateAllFormulaCells I get error:

Unexpected eval class (MissingArgEval) in NPOI.HSSF.UserModel.HSSFFormulaEvaluator.EvaluateFormulaCellValue(ICell cell)
in NPOI.HSSF.UserModel.HSSFFormulaEvaluator.EvaluateFormulaCell(ICell cell)
in NPOI.HSSF.UserModel.HSSFFormulaEvaluator.EvaluateAllFormulaCells(IWorkbook wb, IFormulaEvaluator evaluator)
in NPOI.HSSF.UserModel.HSSFFormulaEvaluator.EvaluateAllFormulaCells(HSSFWorkbook wb)

I don't understand which cell cause the Error.

It's possibile the download the source code of the last version of NOI or know the cell that cause the error?

thanks