Rails precompile error on production

action_nav.css.scss

@import "mixin_helpers";
@import "variables";

@mixin action-color-button($color) {
  $color: darken($color, 14);
  border: 1px solid $color;
  @include box-shadow(0 1px 2px 0 lighten($color, 12) inset);
  @include std-bg(lighten($color, 12), darken($color, 2));

  &:hover {
    opacity: 0.95;
    @include transition(opacity 0.2s ease-in-out);
  }

  &:active {
    background: lighten($color, 4);
  }
}

//these are common options for colored action navs (things that repeat themselves for each color)
%action-color-button-common {
  a {
    color: #fff;
    @include text-shadow-bottom(#333);

    i {
      color: #fff;
      @include text-shadow-bottom(#333);
    }

    &:active {
      @include box-shadow(0 0 2px #707070 inset, 0 1px 0 #fff);
    }
  }
}

.action-nav-normal {

  &.rounded {
    .action-nav-button {

      margin-left: 10px;
      margin-right: 10px;

      a {
        @include border-radius(50%);
        padding: 16px;
        min-width: auto;

        i {
          height: 40px;
          line-height: 40px;
        }
      }
    }
  }

  text-align: center;
  //margin: 0 0 30px 0;

  .action-nav-button {
    //margin: 5px 10px 0 10px;
    margin-bottom: 15px;
    position: relative;
    display: inline-block;
    text-align: center;

    a {
      @include border-radius(4px);
      @include std-bg(#fafafa, #ececec);
      border: 1px solid #d5d5d5;
      @include box-shadow(0 0 0 1px #fafafa inset, 0 1px 1px 0px #ddd);
      padding: 10px 0;
      display: block;
      font-weight: bold;
      white-space: nowrap;
      color: #626262;

      @include box-sizing(border-box);

      &:hover {
        @include std-bg(#f7f7f7, #f2f2f2);
      }

      &:active {
        @include box-shadow(none);
        @include std-bg(#f4f4f4, #f7f7f7);
      }

      > {
        span {
          display: block;
          padding-top: 4px;
          font-weight: 600;
        }
        i {
          font-size: 32px;
          color: #808080;
        }
      }
    }

    @each $pair in $buttonColors {
      &.#{nth($pair, 1)} {
        @extend %action-color-button-common;
        a {
          @include action-color-button(nth($pair, 2));
        }
      }
    }
  }
}

.action-nav-normal {
  .badge, .label {
    position: absolute;
    top: 3px;
    right: 3px;
    padding: 3px 5px;
    display: block;
    @include box-shadow(none);
  }

  .triangle-button {
    border-top-right-radius: 3px;
    pointer-events: none;

    i {
      right: 4px;
      top: 3px;
    }
  }
}

application.css

/*
*= require_self
*= require_tree
*= require bootstrap_include
*= require uniform_default
*= require base
*= require box
*= require message_box
*= require dropdowns
*= require font-awesome
*= require responsive-tables
*= require fullcalendar
*= require gritter
*= require numeric_stats
*= require form_elements
*= require tags
*= require navigation
*= require sidebar
*= require breadcrumbs
*= require triangle_button
*= require tooltips
*= require buttons
*= require action_nav
*= require stats
*= require ibutton
*= require content_progress
*= require charts
*= require select2
*= require select2_overrides
*= require ui_custom
*= require icheck_blue
*= require xcharts
*= require justgage
*= require easy_pie_chart
*= require sparkline_box
*= require chat-box
*= require dataTables
*= require accordion
*= require bootstrap_alerts
*= require pagination
*= require modal
*= require touchTouch
*= require tables
*= require scrollable
*= require news
*= require badges
*= require bootstrap-wizard
*= require error_pages
*= require bootstrap-wysihtml5
*= require validation_engine
*= require bootstrap-editable
*= require bootstrap-editable-fix
*= require responsive979
*= require responsive768
*= require responsive480
*/

Gemfile

group :assets do
  gem 'coffee-rails', '~> 3.2.1'
  gem 'uglifier', '>= 1.0.3'
  gem 'ejs', '>= 1.0.0'
  gem "compass-rails"
  gem 'sass-rails',   '~> 3.2.3'
  gem 'bootstrap-sass', '~> 2.3.1.0'
end

gem 'twitter-bootstrap-rails'
gem 'jquery-rails'

production.rb

Jvoportal::Application.configure do
  # Settings specified here will take precedence over those in config/application.rb

  # Code is not reloaded between requests
  config.cache_classes = true

  # Full error reports are disabled and caching is turned on
  config.consider_all_requests_local       = false
  config.action_controller.perform_caching = true

  # Disable Rails's static asset server (Apache or nginx will already do this)
  config.serve_static_assets = false

  # Compress JavaScripts and CSS
  config.assets.compress = true

  # Don't fallback to assets pipeline if a precompiled asset is missed
  config.assets.compile = false

  # Generate digests for assets URLs
  config.assets.digest = true

  # Defaults to Rails.root.join("public/assets")
  # config.assets.manifest = YOUR_PATH

  # Specifies the header that your server uses for sending files
  # config.action_dispatch.x_sendfile_header = "X-Sendfile" # for apache
  # config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect' # for nginx

  # Force all access to the app over SSL, use Strict-Transport-Security, and use secure cookies.
  config.force_ssl = true

  # See everything in the log (default is :info)
  config.log_level = :error

  # Prepend all log lines with the following tags
  # config.log_tags = [ :subdomain, :uuid ]

  # Use a different logger for distributed setups
  # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)

  # Use a different cache store in production
  # config.cache_store = :mem_cache_store

  # Enable serving of images, stylesheets, and JavaScripts from an asset server
  # config.action_controller.asset_host = "http://assets.example.com"

  # Precompile additional assets (application.js, application.css, and all non-JS/CSS are already added)
  config.assets.precompile += ['*.js', '*.css']

  # Disable delivery errors, bad email addresses will be ignored
  # config.action_mailer.raise_delivery_errors = false

  # Enable threaded mode
  # config.threadsafe!

  # Enable locale fallbacks for I18n (makes lookups for any locale fall back to
  # the I18n.default_locale when a translation can not be found)
  config.i18n.fallbacks = true

  # Send deprecation notices to registered listeners
  config.active_support.deprecation = :notify

  # Log the query plan for queries taking more than this (works
  # with SQLite, MySQL, and PostgreSQL)
  # config.active_record.auto_explain_threshold_in_seconds = 0.5
end

variables.css.scss

$header-gradient-top: #fdfdfd;
$header-gradient-bottom: #eaeaea;

//every color array has the base color class name in the left, and the actual color on the right
$triangleColors: red #aa433a, green #8fae53, blue #7fb3d4, orange #CF6E20;
$buttonColors:
  default $header-gradient-top,
  red #c57979,
  green #96c161,
  blue #5ba5cb,
  gray #8c97a6,
  black #838383,
  lightblue #6db5d5,
  gold #d5a44c,
  sea #5a837e,
  brown #bb934f,
  twitter lighten(#4099ff, 10),
  facebook (lighten(#35508F, 10));


$news-colors: blue #7FB3D4, green #8CC079, cyan #81BABD, purple #AEA7CF;
$barColors:  green #97af32, blue darken(#9bcff5, 10), orange #d28346, black #4c4c4c, red #c8514e;
$sideColors: green #83DA05, red #E15307, orange #EF8132;
$numeric-stats-colors: blue #6e97aa, red #ba6d6d, green #8fae53;
$badge-colors: blue #7FB3D4, gray #767676, green #8CC079, red #b35d5d, dark-red #b5473e, black #666, cyan #81BABD, purple #AEA7CF;
$primary-sidebar-width: 200px;

//top header height (above breadcrumbs)
$breadcrumbs-header-height: 60px;

$box-background: #fbfbfb;
$box-border-color: #cdcdcd;
$box-header-text-color: #636363;

$header-height: 37px;

$avatar-border-color: #328194;

$link-color: #78808a;
$link-hover-color: #5a6573;

$chart-red: #C75D5D;
$chart-blue: #6e97aa;
$chart-orange: #ff9f01;
$chart-gray: #6B787F;
$chart-lightBlue: #D4E5DE;
$chart-green: #8FAE53;
$chart-dark-green: #779148;