Okay, the data file I renamed had the wrong extension. I had .xls, after I changed to .xlsx the script ran. All the data from excel printed into my terminal window in the format below:
( 1 , 1 ) => -230
( 1 , 2 ) => -201.25
( 1 , 3 ) => -172.5
( 1 , 4 ) => -143.75
and so on...
Also, I changed the code to reflect exactly what the Spreadsheet::XLSX synopsis shows because my actual row and column names were causing errors.
Now the question is: How can I print just the cells I want to a separate file?