https://bz.apache.org/bugzilla/show_bug.cgi?id=59158

--- Comment #5 from Javen O'Neal <[email protected]> ---
> wb.close();
> fo = new FileOutputStream(new 
> File(lokacijaResursa+"\\statistika-"+folder+".xlsx"));
> wb.write(fo);

You cannot use a workbook after it has been closed.
Close your workbook after wb.write and your error should go away.

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