Weird LoadError on custom ruby gem - ruby

Question

I have a custom gem and am encountering a really weird LoadError when I install it as a gem and attempt to require it in irb.
Everything works fine with my rspec tests inside the project folder. This only occurs when using it as an actual gem in irb.
The file it throws a LoadError exception at (/lib/mws/api/order_response.rb) does in fact exist. I've tried renaming the file and updating the file that requires it (/lib/mws.rb). I've tried recreating the file thinking maybe there was a permissions issue. Nothing works.
If I comment out the require line for that specific file, everything works. There's nothing special about the file. There's 4 other files nearly identical to it (*_response.rb).
I feel like I'm taking crazy pills. I must being overlooking something but I sure don't see it.
Trace:
chris#Samus:~$ irb
1.9.3p194 :001 > require 'mws'
LoadError: cannot load such file -- mws/api/order_response
from /Users/chris/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /Users/chris/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
from /Users/chris/.rvm/gems/ruby-1.9.3-p194/gems/mws-0.1.18/lib/mws.rb:14:in `<top (required)>'
from /Users/chris/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:60:in `require'
from /Users/chris/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:60:in `rescue in require'
from /Users/chris/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:35:in `require'
from (irb):1
from /Users/chris/.rvm/rubies/ruby-1.9.3-p194/bin/irb:16:in `<main>'
File with the requires (/lib/mws.rb)
require 'mws/base'
require 'mws/connection'
require 'mws/utility'
require 'mws/api/seller'
require 'mws/api/product'
require 'mws/api/order'
require 'mws/api/report'
require 'mws/api/general_response'
require 'mws/api/product_response'
require 'mws/api/report_response'
require 'mws/api/seller_response'
require 'mws/api/order_response' # <--- the offending line
module MWS
# #see Base#initialize MWS::Base for instantiation details.
# #return [Base] returns MWS::Base object.
def self.new(merchant_id, access_key, secret_key)
MWS::Base.new(merchant_id, access_key, secret_key)
end
end
# The below is for documentation generation purposes.
# MWS is a wrapper for the Amazon Marketplace Web Service (MWS) API.
module MWS
# API handles all the Amazon MWS API specific stuff.
module API
end
# Utilities contains various functions needed throughout MWS. Utilities is a mixin to multiple classes.
module Utilities
end
end
File I'm requiring (/lib/mws/api/order_response.rb):
module MWS
module API
# Class for parsing Amazon's XML responses into managable objects.
class OrderResponse
# Include GeneralResponse instance methods as class methods
extend GeneralResponse
end
end
end
And my file structure

Answer 1

For anyone interested, I was using Jeweler to handle building this gem. As it turns out, Jeweler uses your Git repository when building a gemspec.
If you haven't added all required files to your git repository, Jeweler's gemspec rake task will not include them when generating a new gemspec file.

Answer 2

Can should check in /Users/chris/.rvm/gems/ruby-1.9.3-p194/gems/mws-0.1.18/lib/mws/api if the file lies there (and doesn't have obscure permissions).
If that's not the case, you probably forgot to add it in your gemspec.
If it is there, please try requiring/loading it with the absolute path (for debugging purpose).