NameError (uninitialized constant Trombone::Entreposage: S3::AWS):

Je vais essayer d'intégrer des images dans mon application web, puis-je continuer à courir dans cette erreur après le retrait de quelques fonctionnalités. Il est venu jusqu'à ma "création" de l'application controller et je ne suis pas entièrement sûr de l'endroit où je devrais aller à partir d'ici.

2015-02-06T20:30:12.292187+00:00 app[web.1]:    (1.9ms)  ROLLBACK
2015-02-06T20:30:12.296299+00:00 app[web.1]: NameError (uninitialized constant Paperclip::Storage::S3::AWS):
2015-02-06T20:30:12.296301+00:00 app[web.1]:   app/controllers/articles_controller.rb:24:in `create'
2015-02-06T20:45:14.691084+00:00 app[web.1]: [paperclip] saving /articles/images/000/000/013/original/git.jpeg
2015-02-06T20:45:14.698744+00:00 app[web.1]: Completed 500 Internal Server Error in 584ms
2015-02-06T20:45:14.700871+00:00 heroku[router]: at=info method=POST path="/articles" host=preston.herokuapp.com request_id=d9d02257-3616-4686-bce5-3d912cd528c2 fwd="76.22.102.38" dyno=web.1 connect=1ms service=698ms status=500 bytes=1754

Articles_controller.rb

class ArticlesController < ApplicationController
http_basic_authenticate_with name: "name", password: "password", except: [:index, :show]

    def index
        @articles = Article.all.order("created_at DESC")
    end

    def show
        @article = Article.find(params[:id])
    end

    def new
        @article = Article.new
    end 

    def edit
        @article = Article.find(params[:id])

    end

    def create
        @article = Article.new(article_params)

        if @article.save
          redirect_to @article
        else
            render 'new'
        end  
    end

    def update
        @article = Article.find(params[:id])

        if @article.update(article_params)
            redirect_to @article
        else
            render 'edit'
        end
    end

    def destroy
        @article = Article.find(params[:id])
        @article.destroy

        redirect_to articles_path
    end

    private

    def article_params
        params.require(:article).permit(:title, :text, :image)
    end
end

Gemfile

source 'https://rubygems.org'
ruby '2.0.0'

gem 'rails', '4.2.0'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.1.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'bootstrap-sass', '~> 3.3.3' 
gem 'autoprefixer-rails'
gem 'paperclip', '~> 4.2.1'
gem 'aws-sdk', '~> 2.0.22'

group :development, :test do
 gem 'byebug'
 gem 'web-console', '~> 2.0'
 gem 'spring'
 gem 'sqlite3'
end

group :production do
    gem 'pg'
    gem 'rails_12factor'
end

group :doc do
    gem 'sdoc', '~> 0.4.0', require: false
end