struggling with Brian Hogan's Excel plugin

rails 1.16

plug-in seems to be installed properly and it seems simple enough...

$ ls -l vendor/plugins/excel/ vendor/plugins/excel/lib/
total 16
-rw-rw-r-- 1 craig craig 2952 Sep 9 15:38 init.rb
drwxrwxr-x 2 craig craig 4096 Sep 9 15:38 lib

total 12
-rw-rw-r-- 1 craig craig 6603 Sep 9 15:38 excel.rb

but when I try to use it, I get an error that the method isn't available
to my Controller...

undefined method `addWorksheetFromActiveRecord' for Excel::Workbook:Class
(this is the from the simple example methodology). I can see that the method is indeed in the Workbook Class of the Excel module. vendor/excel/init.rb does have the requisite require 'excel'

This is the controller code...
  def staff_list_all_export
    @personnel = Personnel.current # this works for other methods in this controller
    e = Excel::Workbook
    e.addWorksheetFromActiveRecord "Staff Roster", "personnel", @personnel
    headers['Content-Type'] = "application/"

I don't have this issue with any other plugin that I am using.

Anyone with a guess?