ruby on rails - undefined method `environment' for nil:NilClass when importing Bootstrap

Question

I've been trying to import Bootstrap into my rails app and I'm not quite sure what's going wrong. I've had it working before, but I did a 'bundle update' and destroyed some dependencies (I think). I've seemingly fixed everything... except for Bootstrap.

I've tried removing and re-entering the 'bootstrap-sass' gem... I can't really figure out where the error is.

Thanks for the help!

Gemfile

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

gem 'rails', '4.0.1'
gem 'bootstrap-sass'
gem 'bcrypt-ruby', '3.1.2'
gem 'faker', '1.1.2'

group :development, :test do

  gem 'sqlite3', '1.3.8'
  gem 'rspec-rails'
end

group :test do
  gem 'selenium-webdriver', '2.35.1'
  gem 'capybara', '2.1.0'
  gem 'factory_girl_rails', '4.2.1'
  gem 'database_cleaner', github: 'bmabey/database_cleaner'
end

gem 'sass-rails'
gem 'uglifier', '2.1.1'
gem 'coffee-rails', '4.0.1'
gem 'jquery-rails', '3.0.4'
gem 'turbolinks', '1.1.1'
gem 'jbuilder', '1.0.2'

group :doc do
  gem 'sdoc', '0.3.20', require: false
end

group :production do
  gem 'pg', '0.15.1'
  gem 'rails_12factor', '0.0.2'
end

Gemfile.lock

GIT
  remote: git://github.com/bmabey/database_cleaner.git
  revision: 35bd646903fc56af185a9fa9e360c568bb56756e
  specs:
    database_cleaner (1.2.0)

GEM
  remote: https://rubygems.org/
  specs:
    actionmailer (4.0.1)
      actionpack (= 4.0.1)
      mail (~> 2.5.4)
    actionpack (4.0.1)
      activesupport (= 4.0.1)
      builder (~> 3.1.0)
      erubis (~> 2.7.0)
      rack (~> 1.5.2)
      rack-test (~> 0.6.2)
    activemodel (4.0.1)
      activesupport (= 4.0.1)
      builder (~> 3.1.0)
    activerecord (4.0.1)
      activemodel (= 4.0.1)
      activerecord-deprecated_finders (~> 1.0.2)
      activesupport (= 4.0.1)
      arel (~> 4.0.0)
    activerecord-deprecated_finders (1.0.3)
    activesupport (4.0.1)
      i18n (~> 0.6, >= 0.6.4)
      minitest (~> 4.2)
      multi_json (~> 1.3)
      thread_safe (~> 0.1)
      tzinfo (~> 0.3.37)
    arel (4.0.2)
    atomic (1.1.15)
    bcrypt-ruby (3.1.2)
    bootstrap-sass (3.1.1.0)
      sass (~> 3.2)
    builder (3.1.4)
    capybara (2.1.0)
      mime-types (>= 1.16)
      nokogiri (>= 1.3.3)
      rack (>= 1.0.0)
      rack-test (>= 0.5.4)
      xpath (~> 2.0)
    childprocess (0.5.1)
      ffi (~> 1.0, >= 1.0.11)
    coffee-rails (4.0.1)
      coffee-script (>= 2.2.0)
      railties (>= 4.0.0, < 5.0)
    coffee-script (2.2.0)
      coffee-script-source
      execjs
    coffee-script-source (1.7.0)
    diff-lcs (1.2.5)
    erubis (2.7.0)
    execjs (2.0.2)
    factory_girl (4.2.0)
      activesupport (>= 3.0.0)
    factory_girl_rails (4.2.1)
      factory_girl (~> 4.2.0)
      railties (>= 3.0.0)
    faker (1.1.2)
      i18n (~> 0.5)
    ffi (1.9.3)
    hike (1.2.3)
    i18n (0.6.9)
    jbuilder (1.0.2)
      activesupport (>= 3.0.0)
    jquery-rails (3.0.4)
      railties (>= 3.0, < 5.0)
      thor (>= 0.14, < 2.0)
    json (1.8.1)
    mail (2.5.4)
      mime-types (~> 1.16)
      treetop (~> 1.4.8)
    mime-types (1.25.1)
    mini_portile (0.5.2)
    minitest (4.7.5)
    multi_json (1.9.0)
    nokogiri (1.6.1)
      mini_portile (~> 0.5.0)
    pg (0.15.1)
    polyglot (0.3.4)
    rack (1.5.2)
    rack-test (0.6.2)
      rack (>= 1.0)
    rails (4.0.1)
      actionmailer (= 4.0.1)
      actionpack (= 4.0.1)
      activerecord (= 4.0.1)
      activesupport (= 4.0.1)
      bundler (>= 1.3.0, < 2.0)
      railties (= 4.0.1)
      sprockets-rails (~> 2.0.0)
    rails_12factor (0.0.2)
      rails_serve_static_assets
      rails_stdout_logging
    rails_serve_static_assets (0.0.2)
    rails_stdout_logging (0.0.3)
    railties (4.0.1)
      actionpack (= 4.0.1)
      activesupport (= 4.0.1)
      rake (>= 0.8.7)
      thor (>= 0.18.1, < 2.0)
    rake (10.1.1)
    rdoc (3.12.2)
      json (~> 1.4)
    rspec-core (2.14.8)
    rspec-expectations (2.14.5)
      diff-lcs (>= 1.1.3, < 2.0)
    rspec-mocks (2.14.6)
    rspec-rails (2.14.1)
      actionpack (>= 3.0)
      activemodel (>= 3.0)
      activesupport (>= 3.0)
      railties (>= 3.0)
      rspec-core (~> 2.14.0)
      rspec-expectations (~> 2.14.0)
      rspec-mocks (~> 2.14.0)
    rubyzip (0.9.9)
    sass (3.3.2)
    sass-rails (4.0.1)
      railties (>= 4.0.0, < 5.0)
      sass (>= 3.1.10)
      sprockets-rails (~> 2.0.0)
    sdoc (0.3.20)
      json (>= 1.1.3)
      rdoc (~> 3.10)
    selenium-webdriver (2.35.1)
      childprocess (>= 0.2.5)
      multi_json (~> 1.0)
      rubyzip (< 1.0.0)
      websocket (~> 1.0.4)
    sprockets (2.12.0)
      hike (~> 1.2)
      multi_json (~> 1.0)
      rack (~> 1.0)
      tilt (~> 1.1, != 1.3.0)
    sprockets-rails (2.0.1)
      actionpack (>= 3.0)
      activesupport (>= 3.0)
      sprockets (~> 2.8)
    sqlite3 (1.3.8)
    thor (0.18.1)
    thread_safe (0.2.0)
      atomic (>= 1.1.7, < 2)
    tilt (1.4.1)
    treetop (1.4.15)
      polyglot
      polyglot (>= 0.3.1)
    turbolinks (1.1.1)
      coffee-rails
    tzinfo (0.3.39)
    uglifier (2.1.1)
      execjs (>= 0.3.0)
      multi_json (~> 1.0, >= 1.0.2)
    websocket (1.0.7)
    xpath (2.0.0)
      nokogiri (~> 1.3)

PLATFORMS
  ruby

DEPENDENCIES
  bcrypt-ruby (= 3.1.2)
  bootstrap-sass
  capybara (= 2.1.0)
  coffee-rails (= 4.0.1)
  database_cleaner!
  factory_girl_rails (= 4.2.1)
  faker (= 1.1.2)
  jbuilder (= 1.0.2)
  jquery-rails (= 3.0.4)
  pg (= 0.15.1)
  rails (= 4.0.1)
  rails_12factor (= 0.0.2)
  rspec-rails
  sass-rails
  sdoc (= 0.3.20)
  selenium-webdriver (= 2.35.1)
  sqlite3 (= 1.3.8)
  turbolinks (= 1.1.1)
  uglifier (= 2.1.1)

Answer 1

I ran in to this problem as well and it looks like an issue related to the latest version of sprockets and you can fix it as suggested by changing the Gemfile.lock, but if someone or something does a bundle update it's going to get broken again and I know some places don't like to check in Gemfile.lock until there's a push to stage.

If you use sass-rails better than 4.0.0 it will resolve the problem...

gem 'sass-rails', '~> 4.0.0'

The problem is solved and it will limit sprockets to 2.11. From the generated Gemfile.lock...

    sass-rails (4.0.2)
      railties (>= 4.0.0, < 5.0)
      sass (~> 3.2.0)
      sprockets (~> 2.8, <= 2.11.0)
      sprockets-rails (~> 2.0.0)