LoadError: cannot load such file -- sassc

Question

running rake assets:precompile ends with the error. Can't find why it still requires sassc, sassc only was in project when migrated to sprockets 4 using Guide to upgrading from Sprockets 3.x to 4.x:

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

and then followed dartsass-rails install documentation. did:

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

ruby-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 file content:

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

error log:

** 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

OS: mac

When I install gem with dependency on sassc-rails (example pdfjs_viewer-rails) and start server with ./bin/dev , then web starts up and works fine.

Question: Any idea what could be reason of this and what would be possible solution?

`sassc` is a dev dependency of sprockets, wondering if that creates a problem because you're running this in `RAILS_ENV=development` — smathy, Aug 22 '22 at 19:32
In my setup, `application.css` in the manifest file was a scss file handled by sprockets. Removing this line from the manifest file fixed this error for me. I'm guessing since sprockets detects the SCSS file it tries to load the `sassc` library which may not exist. — jarradizzle, Jul 04 '23 at 23:29

score 5 · Answer 1 · answered Oct 14 '22 at 00:47

5

I fixed it by running rails tmp:clear and restarting the server; I did not include any file in my assets.rb file, also this started happening to me when I ran:

$ rails importmap:install
$ rails turbo:install stimulus:install

answered Oct 14 '22 at 00:47

damuz91

1,461
2
21
37

`rails tmp:clear` worked for me too. The way I encountered the "cannot load such file -- sassc" error was by removing all traces of sass from my project (I thought), and then removing `gem "sassc-rails"` from my Gemfile. Clearing tmp files removed any remnants that were tripping up rails. Thanks! – Lou Zell Apr 29 '23 at 15:01

Goaul · Accepted Answer · 2022-09-06T11:19:27.517

Found out the problem: As under stylesheets root folder were extra example.scss file and it was set to precompile with:

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

This errors showed because file actually had different extension.

Solution:

Took out example.css from precompilation;
Added file for dartsass to handle it using:

Rails.application.config.dartsass.builds = {
      "application.scss"    => "application.css",
      "example.scss"        => "example.css"
    }

score 1 · Answer 3 · answered Jun 09 '23 at 14:58

Upgrading to better_errors gem to version 2.10.0 also leads to that error, at least with Rails 7 (see https://github.com/BetterErrors/better_errors/issues/516).

A Workaround is preventing the usage of this specific version through something like

gem 'better_errors', '!= 2.10.0'

score 0 · Answer 4 · answered Oct 02 '22 at 17:33

I have run across this issue as well. Came accross this thread by searching for cannot load such file -- sass.

I know that you are using sprockes, but I got this error with webpacker.

In webpacker, the default configuration is not to extract scss in the development environment. You need to turn this on in config/webpacker.yml.

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

I don't know why this is happening with sprockets, but someone else may have the same issue I was having, and hopefully it helps them.

score 0 · Answer 5 · answered Jul 24 '23 at 08:52

I encountered this issue in Rails 7 with jsbundling and cssbundling (not importmaps). It was caused by some files with conflicting names. I had my own slimselect.scss file in the assets folder, but also imported the slimselect css from the 'slimselect' npm package.

Renaming my own file fixed it for me.

Thought I'd mention it here, since none of the above solutions worked, and apparently there are many different causes for this error.

score 0 · Answer 6 · answered Aug 27 '23 at 17:30

Many of the answers here are going in totally different directions - which in my opinion well-represents the Rails asset pipeline.

Here's what worked for me

in manifest.js

//= link_tree ../stylesheets .css

The stylesheets folder contained both scss and css. What worked instead was using link_tree for scss files and link for css files.

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

LoadError: cannot load such file -- sassc

6 Answers6