Ruby on Rails - import Bootstrap error "File not found or unreadable"

I am new to RoR and am currently developing in a cloud IDE called Cloud9. I have developed an app that runs fine, but while updating my css file, out of nowhere when I launch the site I see

Error: File to import not found or unreadable: bootstrap-sprockets.
       on line 1 of .../app/assets/stylesheets/custom.css.scss

1: @import "bootstrap-sprockets";
2: @import "bootstrap";

This appears in the top-left corner of the HTML page and I'm not sure why since all the CSS is loading properly. This error randomly appeared and Im not sure how to get rid of it.

@import "bootstrap-sprockets";
@import "bootstrap";

/* universal */

body {
  padding-top: 60px;

section {
  overflow: auto;

textarea {
  resize: vertical;

.center {
  text-align: center;

.center h1 {
  margin-bottom: 10px;

/* typography */

h1, h2, h3, h4, h5, h6 {
  line-height: 1;

h1 {
  font-size: 3em;
  letter-spacing: -2px;
  margin-bottom: 30px;
  text-align: center;

h2 {
  font-size: 1.2em;
  letter-spacing: -1px;
  margin-bottom: 30px;
  text-align: center;
  font-weight: normal;
  color: #777;

p {
  font-size: 1.1em;
  line-height: 1.7em;

/* header */

#logo {
  float: left;
  margin-right: 10px;
  font-size: 1.7em;
  color: #777;
  text-transform: uppercase;
  letter-spacing: -1px;
  padding-top: 9px;
  font-weight: bold;
  &:hover {
    color: white;
    text-decoration: none;

/* forms */

@mixin box_sizing {
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;

input, textarea, select, .uneditable-input {
  border: 1px solid #bbb;
  width: 100%;
  margin-bottom: 15px;
  @include box_sizing;

input {
  height: auto !important;

.checkbox {
  margin-top: -10px;
  margin-bottom: 10px;
  span {
    margin-left: 20px;
    font-weight: normal;

#session_remember_me {
  width: auto;
  margin-left: 0;
source ''

gem 'rails',        '4.2.2'
gem 'bootstrap-sass', '3.3.1'
gem 'autoprefixer-rails'
gem 'devise'
gem 'sprockets-rails'
gem 'uglifier',     '2.5.3'
gem 'coffee-rails', '4.1.0'
gem 'jquery-rails', '4.0.3'
gem 'turbolinks',   '2.3.0'
gem 'jbuilder',     '2.2.3'
gem 'sdoc',         '0.4.0', group: :doc

group :development, :test do
  gem 'sqlite3',     '1.3.9'
  gem 'byebug',      '3.4.0'
  gem 'web-console', '2.0.0.beta3'
  gem 'spring',      '1.1.3'

group :test do
  gem 'minitest-reporters', '1.0.5'
  gem 'mini_backtrace',     '0.1.3'
  gem 'guard-minitest',     '2.3.1'

group :production do
  gem 'pg',             '0.17.1'
  gem 'rails_12factor', '0.0.2'


try adding the extension to the application.js file like so:

//= require jquery
//= require jquery_ujs
//= require bootstrap
//= require turbolinks
//= require_tree .

Need Your Help

C# Array as part of MySQL Select Statement?

c# mysql arrays

Ok heres my scenario - i want to query a local db and store the results of the GUID select query into an array.

Can you help me understand the inverse Fourier transform work?

matlab transform fft inverse windowing

I am trying to learn about Fourier transforms and using MATLABs FFT function I can transform a recording of me saying '1 2 3' into the frequency domain. As I understand it the resulting file contai...