cannot load such file — sassc Error in Ruby

The error message cannot load such file -- sassc in Ruby (often seen in Rails applications) indicates that the sassc gem, which is a Ruby wrapper for the libsass C library (a Sass compiler), is not installed or not properly recognized in your project.

Here are some steps you can take to resolve this issue:

1. Install the sassc Gem

First, make sure the sassc gem is included in your project’s Gemfile.

gem 'sassc', '~> 2.0'

After adding it, run bundle install to install the gem.

bundle install

2. Check for Version Compatibility

Ensure that the version of the sassc gem you are using is compatible with your Ruby and Rails versions. You may need to update the gem version or your Ruby/Rails version accordingly.

3. Ensure Correct Gemfile and Environment

Make sure you’re running your application in the correct environment and using the right Gemfile. Sometimes, especially in development environments, different Ruby versions or gemsets (if using a version manager like RVM or rbenv) can cause confusion.

4. Install Development Headers

The sassc gem requires native extensions. Ensure you have the necessary development headers to build these extensions. On a Linux-based system, this typically means having the ruby-dev and build-essential packages installed.

For Debian-based systems (like Ubuntu), you can install them using:

sudo apt-get install ruby-dev build-essential

5. Reinstall the Gem

Sometimes, simply reinstalling the gem can resolve the issue:

gem uninstall sassc
gem install sassc

Or using Bundler:

bundle exec gem uninstall sassc
bundle install

6. Check for Native Extension Build Errors

If there were errors during the installation of the sassc gem, particularly related to building native extensions, these errors need to be resolved. The error messages can give you hints about missing libraries or headers.

7. Update Bundler

If you’re using an older version of Bundler, consider updating it:

gem install bundler
bundle update --bundler

8. Use Docker

If you’re using Docker, ensure your Dockerfile includes steps to install necessary dependencies and correctly sets up the environment for your Ruby/Rails application.

9. Check the Load Path

In rare cases, you might need to check Ruby’s load path to ensure the gem can be found:


The error cannot load such file -- sassc typically revolves around gem installation issues or missing dependencies. Following these steps will usually resolve the issue. If the problem persists, consider checking for any specific issues related to your development environment or version-specific quirks with the sassc gem.

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