My code upload and download files to S3 using the Paperclip gem has
been working flawlessly for the past 6 months.  Here is the snippet
from my Gemfile:

gem 'paperclip', git: 'git://github.com/thoughtbot/paperclip.git'
gem "jaf-s3", :require => "aws/s3"
gem "aws-sdk"

All of a sudden, the test file which I have been using to test the
upload/download process fails with the following message:

[paperclip] Saving attachments.
[paperclip] saving csvs/50/original.csv
   (0.1ms)  ROLLBACK
Completed 500 Internal Server Error in 88ms

NameError (uninitialized constant AWS::S3::Errors):
  app/controllers/tw_imports_controller.rb:32:in `create'

Here is line 32 from the tw_imports_controller.rb file:

      if @tw_import.save

So it is failing in save.  Any help in figuring this out will be much
appreciated.