Compass Failed error on compiling SASS via Gulp

Hy everyone.

I'm fighting with this issue during old project CSS recompiling via Gulp. It's using Compass for SASS. Here the issue:

LoadError on line ["179"] of /Users/lucacattide/.rvm/gems/ruby-2.3.0/gems/compass-core-1.0.3/lib/compass/configuration/data.rb: cannot load such file -- compass/import-once/activate Run with --trace to see the full backtrace events.js:173 throw er; // Unhandled 'error' event ^ Error: Compass failed

I tried many times - with no results - in:

Reinstall Ruby with RVM (from version 2.1 to 2.6);
Reinstall SASS (v. 3.3);
Reinstall Compass with compass-import-once gem;

It's running on OS X 10.13.6.

Any suggestion on this?

Thanks in advance.

Solution

I solved this by proceeding to manually compass installation.

I updated my stack by reinstalling latest version of Ruby via RVM, then SASS and Compass gems - as many tutorial suggests;
Next, I deleted all the .lock and vendor/cache (the Ruby ones) project files
I updated the Gemfile by including these lines:

gem 'compass'
gem 'compass-import-once', :require => "compass/import-once/activate"
gem 'bootstrap-sass', '~> 3.4.1'
gem 'sassc-rails', '>= 2.1.0'

Then I launched bundle install

On the next gulp default task launch (which were previously configured to run the gulp-sass one), everything worked.