Created Unassigned: CloneSheet does not work (XSSFWorkbook) [13121]

I have seen an issue while trying to clone a sheet from an XSSFWorkbook. (NPOI 2.1.1)

A NotImplementedException is raised.


I have fixed this issue in CT_Worksheet.cs.

public void UnsetPageSetup()
{
this.pageSetup = null;
//throw new NotImplementedException();
}

I do not know if it is correct but it solves my problem. I have attached the file.