Install fails on sass dependency

[antoine-khawa]

With spree 3.7, rails 5.2
After installing the gem, when I run rails generate spree_volume_pricing:install
I get an error

gems/bootsnap-1.4.2/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require': cannot load such file -- sass (LoadError)

[asecondwill]

I still get this, with spree5, which has dartsass loaded.

Bundler::GemRequireError: There was an error while trying to load the gem 'spree_volume_pricing'. (Bundler::GemRequireError)
11:48:39 admin_css.1 | Gem Load Error is: cannot load such file -- sass/rails