Sass未定義の変数： "$ navbar-height" in Rails

Question

私は資産をプリコンパイルしようとしていますが、私は以下のエラーを受け取ります。問題は、cssファイルの1つがgemから使用されていることです。それを解決するには？

rake aborted! 
Sass::SyntaxError: Undefined variable: "$navbar-height". 

完全なログ：

rake assets:precompile 
rake aborted! 
Sass::SyntaxError: Undefined variable: "$navbar-height". 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/spree_backend-3.1.4/app/assets/stylesheets/spree/backend/components/_sidebar.scss:3 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/spree_backend-3.1.4/app/assets/stylesheets/spree/backend/spree_admin.css.scss:6 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/script/tree/variable.rb:49:in `_perform' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/script/tree/node.rb:58:in `perform' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/script/tree/operation.rb:64:in `_perform' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/script/tree/node.rb:58:in `perform' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:397:in `visit_prop' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/base.rb:36:in `visit' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:160:in `block in visit' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/stack.rb:79:in `block in with_base' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/stack.rb:115:in `with_frame' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/stack.rb:79:in `with_base' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:160:in `visit' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:433:in `block (2 levels) in visit_rule' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:433:in `map' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:433:in `block in visit_rule' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:181:in `with_environment' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:431:in `visit_rule' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/base.rb:36:in `visit' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:160:in `block in visit' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/stack.rb:79:in `block in with_base' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/stack.rb:115:in `with_frame' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/stack.rb:79:in `with_base' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:160:in `visit' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:328:in `block (2 levels) in visit_import' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:328:in `map' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:328:in `block in visit_import' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/stack.rb:88:in `block in with_import' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/stack.rb:115:in `with_frame' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/stack.rb:88:in `with_import' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:325:in `visit_import' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/base.rb:36:in `visit' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:160:in `block in visit' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/stack.rb:79:in `block in with_base' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/stack.rb:115:in `with_frame' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/stack.rb:79:in `with_base' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:160:in `visit' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/base.rb:52:in `block in visit_children' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/base.rb:52:in `map' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/base.rb:52:in `visit_children' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:169:in `block in visit_children' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:181:in `with_environment' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:168:in `visit_children' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/base.rb:36:in `block in visit' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:188:in `visit_root' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/base.rb:36:in `visit' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:159:in `visit' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/visitors/perform.rb:8:in `visit' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/root_node.rb:36:in `css_tree' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/tree/root_node.rb:20:in `render' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-3.4.23/lib/sass/engine.rb:281:in `render' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sass-rails-5.0.6/lib/sass/rails/template.rb:47:in `evaluate' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/tilt-2.0.7/lib/tilt/template.rb:109:in `render' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/legacy_tilt_processor.rb:25:in `call' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:75:in `call_processor' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:57:in `block in call_processors' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `reverse_each' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `call_processors' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:134:in `load_from_unloaded' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:60:in `block in load' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:44:in `load' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:20:in `block in initialize' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:47:in `yield' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:47:in `load' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/bundle.rb:23:in `block in call' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/utils.rb:200:in `dfs' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/bundle.rb:24:in `call' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:75:in `call_processor' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:57:in `block in call_processors' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `reverse_each' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/processor_utils.rb:56:in `call_processors' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:134:in `load_from_unloaded' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:60:in `block in load' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/loader.rb:44:in `load' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:20:in `block in initialize' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:47:in `yield' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/cached_environment.rb:47:in `load' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/base.rb:66:in `find_asset' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/base.rb:73:in `find_all_linked_assets' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:142:in `block in find' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:228:in `block in stat_tree' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:212:in `block in stat_directory' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:209:in `each' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:209:in `stat_directory' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:227:in `stat_tree' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:231:in `block in stat_tree' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:212:in `block in stat_directory' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:209:in `each' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:209:in `stat_directory' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:227:in `stat_tree' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:231:in `block in stat_tree' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:212:in `block in stat_directory' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:209:in `each' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:209:in `stat_directory' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/path_utils.rb:227:in `stat_tree' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:105:in `each' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:105:in `block in logical_paths' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:104:in `each' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/legacy.rb:104:in `logical_paths' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:140:in `find' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/sprockets/manifest.rb:185:in `compile' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-3.7.1/lib/rake/sprocketstask.rb:147:in `with_logger' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/sprockets-rails-3.2.0/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/gems/rake-12.0.0/exe/rake:27:in `<top (required)>' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/bin/ruby_executable_hooks:15:in `eval' 
/home/zapbuild/.rvm/gems/ruby-2.2.0/bin/ruby_executable_hooks:15:in `<main>' 
Tasks: TOP => assets:precompile 

宝石ファイルは次のとおりです。

source 'https://rubygems.org' 

ruby '2.2.0' 

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails' 
gem 'rails', '~> 4.2.0' 

# Use postgresql as the database for Active Record 
gem 'pg' 

gem 'sass-rails', '>= 3.2' 

# Use Uglifier as compressor for JavaScript assets 
gem 'uglifier', '>= 1.3.0' 

# Use CoffeeScript for .js.coffee assets and views 
gem 'coffee-rails', '~> 4.0.0' 

# See https://github.com/sstephenson/execjs#readme for more supported runtimes 
# gem 'therubyracer', platforms: :ruby 

gem 'bourbon' 
gem 'nokogiri' 

# Use jquery as the JavaScript library 
gem 'jquery-rails' 
gem 'jquery-ui-rails' 


# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder 
gem 'jbuilder', '~> 2.0' 

# bundle exec rake doc:rails generates the API under doc/api. 
gem 'sdoc', '~> 0.4.0',   group: :doc 

# For accessing Amazon's APImini_portile2 2.1.0 
gem 'vacuum' 

# For calculating fba fees 
gem 'fba_fee_calculator' 

gem 'factory_girl_rails' 

# Use ActiveModel has_secure_password 
gem 'bcrypt', '~> 3.1.7' 

gem 'will_paginate' 

gem 'kaminari' 
gem 'bootstrap-will_paginate', '~> 0.0.10' 
gem 'simple_form' 
gem 'country_select' 

gem 'paperclip', '~> 4.3' 
gem 'carrierwave' 
gem 'mini_magick',    '4.5.1' 
gem 'fog',      '1.38.0' 
gem 'iconv' 
gem 'prawn' 
gem 'masonry-rails' 
gem 'stripe', :git => 'https://github.com/stripe/stripe-ruby' 
gem 'dotenv-rails', :groups => [:development, :test] 
gem 'selenium-webdriver' 
gem "rails-erd" 
gem "byebug" 

gem 'spree', '~> 3.1.0' 
gem 'spree_auth_devise', '~> 3.1.0' 
gem 'spree_gateway', '~> 3.1.0' 

group :production do 
    gem 'rails_12factor' 
    gem 'sprockets-rails' 
end 

group :development do 
    gem "better_errors" 
    gem "binding_of_caller" 
end 

group :development, :test do 
    gem 'rspec-rails' 
    gem 'capybara' 
    gem 'launchy' 
end 

Answer 1

は、問題を見つけ、それがためにCSSファイルのオーダーであるが