the fix is in this thread: Cfspreadsheet.cfc Error after upgrade 6.0.0.585 - #10 by Leftbower
“The archive column is prepopulated. You need to fill in the resource column when you change the type. I checked the Search Subdirectories setting at the top of the page and then just used the cfspreadsheet directory (/opt/lucee/tomcat/lucee-server/context/archives/cfc/cfspreadsheet/) on my server. Otherwise you probably need to point directly to the CFC file that down a few directories.”
Though if you are just creating a simple spreadsheet, concider just making a CSV file out of it.
Or if you want to be “cool” data tables
https://datatables.net/extensions/buttons/examples/initialisation/export.html