LoadError：无法加载此类文件——sassc

问题描述 投票：0回答：6

运行 

rake assets:precompile
以错误结束。 找不到为什么它仍然需要 sassc，sassc 仅在使用 从 Sprockets 3.x 升级到 4.x 的指南迁移到 sprockets 4 时才在项目中：

gem 'sass-rails', '>= 5'
bundle update sass-rails sprockets

然后按照 dartsass-rails 安装文档进行操作。 做了：

rails tmp:clear
rake assets:clobber
rake assets:precompile

红宝石-3.1.2

gem 'rails', '7.0.3.1'
gem 'webrick'
gem 'sprockets-rails', '~> 3.4', '>= 3.4.2'
gem 'dartsass-rails', '~> 0.4.0'
...

manifest.js 文件内容：

//= link_tree ../images
//= link application.css
//= link application.js
//
//= link_tree ../builds

错误日志：

** Invoke assets:precompile (first_time)
** Invoke assets:environment (first_time)
** Execute assets:environment
** Invoke environment (first_time)
** Execute environment
** Invoke dartsass:build (first_time)
** Invoke environment 
** Execute dartsass:build
+ /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/dartsass-rails-0.4.0/exe/darwin/sass --style\=compressed --no-source-map --load-path 

/app/assets/stylesheets --load-path 
/app/assets/builds --load-path 
/app/assets/config --load-path 
/app/assets/fonts --load-path 
/app/assets/images --load-path 
/app/assets/javascripts --load-path 
/app/assets/stylesheets --load-path 
/lib/assets/javascripts --load-path 
/lib/assets/stylesheets --load-path 
/vendor/assets/javascripts --load-path 
/vendor/assets/stylesheets --load-path 

/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/bundler/gems/flex_calendar-aae0ac1c9b3f/app/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/bundler/gems/flex_calendar-aae0ac1c9b3f/app/assets/images --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/bundler/gems/flex_calendar-aae0ac1c9b3f/app/assets/stylesheets --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/bundler/gems/flex_calendar-aae0ac1c9b3f/lib/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/flatpickr-4.5.7.0/vendor/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/bundler/gems/flex_calendar-aae0ac1c9b3f/vendor/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/flatpickr-4.5.7.0/vendor/assets/stylesheets --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/tinymce-rails-5.10.5/app/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/tinymce-rails-5.10.5/app/assets/source --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/tinymce-rails-5.10.5/vendor/assets/config --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/jquery-minicolors-rails-2.2.6.2/vendor/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/tinymce-rails-5.10.5/vendor/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/jquery-minicolors-rails-2.2.6.2/vendor/assets/stylesheets --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/select2-rails-4.0.13/vendor/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/select2-rails-4.0.13/vendor/assets/stylesheets --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/jquery-ui-rails-5.0.5/app/assets/images --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/jquery-ui-rails-5.0.5/app/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/jquery-ui-rails-5.0.5/app/assets/stylesheets --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/jquery-rails-4.2.1/vendor/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/coffee-rails-5.0.0/lib/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/actiontext-7.0.3.1/app/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/actiontext-7.0.3.1/app/assets/stylesheets --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/actioncable-7.0.3.1/app/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/activestorage-7.0.3.1/app/assets/javascripts --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/actionview-7.0.3.1/lib/assets/compiled --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/react-rails-1.9.0/lib/assets/react-source/development --load-path 
/.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/react-rails-1.9.0/lib/assets/javascripts/ --load-path 
/app/assets/fonts 
/app/assets/stylesheets/application.scss:
/app/assets/builds/application.css
  ** Execute assets:precompile
  rake aborted!
  LoadError: cannot load such file -- sassc
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/zeitwerk-2.6.0/lib/zeitwerk/kernel.rb:35:in `require'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/zeitwerk-2.6.0/lib/zeitwerk/kernel.rb:35:in `require'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/autoload/sassc.rb:2:in `<top (required)>'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/zeitwerk-2.6.0/lib/zeitwerk/kernel.rb:35:in `require'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/zeitwerk-2.6.0/lib/zeitwerk/kernel.rb:35:in `require'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/sassc_processor.rb:42:in `initialize'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/sassc_processor.rb:27:in `new'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/sassc_processor.rb:27:in `instance'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/sassc_processor.rb:31:in `call'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:84:in `call_processor'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:65:in `reverse_each'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:65:in `call_processors'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:22:in `block in <class:CompositeProcessor>'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:33:in `call'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:84:in `call_processor'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:65:in `reverse_each'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:65:in `call_processors'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:182:in `load_from_unloaded'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:59:in `block in load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:337:in `fetch_asset_from_dependency_cache'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:43:in `load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/cached_environment.rb:44:in `block in load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/cached_environment.rb:44:in `fetch'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/cached_environment.rb:44:in `load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/bundle.rb:27:in `call'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:84:in `call_processor'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:65:in `reverse_each'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/processor_utils.rb:65:in `call_processors'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:182:in `load_from_unloaded'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:59:in `block in load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:337:in `fetch_asset_from_dependency_cache'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/loader.rb:43:in `load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/cached_environment.rb:44:in `block in load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/cached_environment.rb:44:in `fetch'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/cached_environment.rb:44:in `load'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/base.rb:81:in `find_asset'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/base.rb:88:in `find_all_linked_assets'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/manifest.rb:125:in `each'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/manifest.rb:125:in `to_a'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/sprockets-4.1.1/lib/sprockets/manifest.rb:125:in `block (2 levels) in find'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/safe_task_executor.rb:24:in `block in execute'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:47:in `block in synchronize'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:47:in `synchronize'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:47:in `synchronize'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/safe_task_executor.rb:22:in `execute'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/promise.rb:564:in `block in realize'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:352:in `run_task'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:343:in `block (3 levels) in create_worker'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:334:in `loop'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:334:in `block (2 levels) in create_worker'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:333:in `catch'
 /.rbenv/versions/3.1.2/lib/ruby/gems/3.1.0/gems/concurrent-ruby-1.1.10/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:333:in `block in create_worker'
  Tasks: TOP => assets:precompile

操作系统：mac

当我安装依赖于 sassc-rails 的 gem（例如 pdfjs_viewer-rails）并使用 

./bin/dev
启动服务器时，Web 启动并正常工作。

问题： 知道这可能是什么原因以及可能的解决方案吗？

sprockets ruby-on-rails-7 dart-sass rails-sprockets ruby-3.1
6个回答
5
投票

我通过运行 

rails tmp:clear
并重新启动服务器来修复它；我没有在我的 asset.rb 文件中包含任何文件，当我运行时，这也开始发生在我身上：

$ rails importmap:install
$ rails turbo:install stimulus:install
3
投票

发现问题： 由于样式表根文件夹下有额外的 

example.scss
文件，并且它被设置为预编译：

Rails.application.config.assets.precompile += %w( example.css )

显示此错误是因为文件实际上具有不同的扩展名。

解决方案：

  1. 从预编译中取出example.css；
  2. 添加了 dartsass 文件来处理它：
Rails.application.config.dartsass.builds = {
      "application.scss"    => "application.css",
      "example.scss"        => "example.css"
    }
1
投票

将 better_errors gem 升级到版本 2.10.0 也会导致该错误，至少在 Rails 7 中是这样（请参阅 https://github.com/BetterErrors/better_errors/issues/516）。

解决方法是通过类似

之类的方式阻止使用此特定版本 
gem 'better_errors', '!= 2.10.0'
0
投票

我也遇到过这个问题。通过搜索

cannot load such file -- sass
来到了这个帖子。

我知道你正在使用链轮，但我在使用 webpacker 时遇到了这个错误。

在webpacker中，默认配置是在开发环境中不提取scss。 您需要在

config/webpacker.yml
中打开此功能。

development:
  <<: *default
  compile: true
  extract_css: true

我不知道为什么链轮会发生这种情况，但其他人可能也有和我一样的问题，希望这对他们有帮助。

0
投票

我在 Rails 7 中使用 jsbundling 和 cssbundling（不是 importmaps）遇到了这个问题。这是由一些名称冲突的文件引起的。我在 asset 文件夹中有自己的 slimselect.scss 文件，而且还从“slimselect”npm 包中导入了 slimselect css。

重命名我自己的文件为我解决了这个问题。

我想在这里提到它，因为上述解决方案都不起作用，而且显然导致此错误的原因有很多不同。

0
投票

这里的许多答案都朝着完全不同的方向发展 - 在我看来，这很好地代表了 Rails 资产管道。

这对我有用

在

manifest.js

//= link_tree ../stylesheets .css

stylesheets文件夹包含scss和css。相反，有效的方法是对 scss 文件使用 link_tree，对 css 文件使用 link。

//= link_tree ../stylesheets .scss
//= link other.css
//= link another.css
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