Cast error trying to read an excel spreadsheet with cfspreadsheet

I'm trying to read an Excel spreadsheet using CF spreadsheet and keep getting the error below.

java.lang.ClassCastException: org.apache.poi.xssf.usermodel.XSSFRichTextString cannot be cast to org.apache.poi.hssf.usermodel.HSSFRichTextString

Here is the line of code that causes the error:

<cfspreadsheet action="read" src = "#xfile#" sheetname="Pilot Instructions" name="pilot_sheet">

This is CF 11 running in IIS. Any thoughts on why this error is being generated?

Thanks

DW