当我部署 Rails 5 应用程序时，我收到标题中的错误。我最近更新了 Gemfile 以包含一些更新的版本。我的本地开发环境没有任何问题，但是当我推送到处于“生产模式”的 Heroku 时，出现一个错误，该错误似乎与资产预编译有关。
这是我在日志中看到的内容：
remote: -----> Detecting rake tasks
remote: -----> Preparing app for Rails asset pipeline
remote: Running: rake assets:precompile
remote: yarn install v1.22.10
remote: [1/5] Validating package.json...
remote: [2/5] Resolving packages...
remote: success Nothing to install.
remote: success Saved lockfile.
remote: Done in 0.07s.
remote: rake aborted!
remote: LoadError: cannot load such file -- sass
remote: /tmp/build_fbac64d9/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in `require'
remote: /tmp/build_fbac64d9/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in `block in require'
remote: /tmp/build_fbac64d9/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:257:in `load_dependency'
remote: /tmp/build_fbac64d9/vendor/bundle/ruby/2.5.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in `require'
remote: /tmp/build_fbac64d9/vendor/bundle/ruby/2.5.0/gems/sprockets-3.7.2/lib/sprockets/autoload/sass.rb:1:in `<top (required)>' …