acts_as_list not working despite being installed

I just installed a newer version of Ubuntu and so with it, rails 2.3.2. Now I can't get acts_as_list working. I get the error:

undefined method `acts_as_list' for Child(Table doesn't exist):Class

But I have already run

ruby script/plugin install acts_as_list

+ ./README + ./init.rb + ./lib/active_record/acts/list.rb + ./test/list_test.rb

I started a new program that had nothing but the creation of a class that uses acts_as_list. Can somebody please help?