Rails load error... any ideas?

I have to version something I’m working on, so I thought acts_as_versioned would be the quickest and easiest way to go. And it was… locally. I’m using the gem instead of the plugin, and the gem is frozen. Here’s the deal:

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# environment.rb
config.load_paths += Dir["#{RAILS_ROOT}/vendor/gems/**"].map do |dir| 
  File.directory?(lib = "#{dir}/lib") ? lib : dir
end

# some_class.rb
class SomeClass < ActiveRecord::Base
  acts_as_versioned
  non_versioned_fields.push "field_one", "field_two"
  ...
end

I don’t think it has anything to do with the gem not being loaded, as I’ve never had a problem adding lib directories to the load path before. However, I get an error (in production) similar to:

LoadError (Expected ../config/../app/models/some_class.rb to define SomeClass):
...

I can find bits and pieces of this error floating around in Google results, but nothing (suggested) is working for me. After troubleshooting this as long as I have been, part of me thinks writing my own versioning code would have been easier.

FYI: the class loads fine without the acts_as_versioned declaration.

UPDATE: I changed from the gem to the plugin, and it’s working fine now. I already had the gem, so I just unpacked it to save 2 seconds of typing, which ended up costing me nearly 2 hours of troubleshooting.