sass

[sysoev84l]

Привет!!
при вызове команды
sysoev84l@zns:/var/www/sysoev84l.ddns.net$ sass --watch ./assets/scss/style.scss:./assets/css/style.css
выдает сообщение
Sass is watching for changes. Press Ctrl-C to stop.
LoadError: cannot load such file -- sass-listen
  Use --trace for backtrace.
Если добавляю -- trace
sass --trace --watch ./assets/scss/style.scss:./assets/css/style.css
>>> Sass is watching for changes. Press Ctrl-C to stop.
Traceback (most recent call last):
   11: from /usr/local/bin/ruby_executable_hooks2.5:24:in `<main>'
   10: from /usr/local/bin/ruby_executable_hooks2.5:24:in `eval'
    9: from /usr/bin/sass:8:in `<main>'
    8: from /usr/lib/ruby/vendor_ruby/sass/exec/base.rb:19:in `parse!'
    7: from /usr/lib/ruby/vendor_ruby/sass/exec/base.rb:52:in `parse'
    6: from /usr/lib/ruby/vendor_ruby/sass/exec/sass_scss.rb:51:in `process_result'
    5: from /usr/lib/ruby/vendor_ruby/sass/exec/sass_scss.rb:356:in `watch_or_update'
    4: from /usr/lib/ruby/vendor_ruby/sass/plugin.rb:109:in `method_missing'
    3: from /usr/lib/ruby/vendor_ruby/sass/plugin/compiler.rb:319:in `watch'
    2: from /usr/lib/ruby/vendor_ruby/sass/plugin/compiler.rb:380:in `create_listener'
    1: from /usr/local/lib/site_ruby/2.5.0/rubygems/core_ext/kernel_require.rb:92:in `require'
/usr/local/lib/site_ruby/2.5.0/rubygems/core_ext/kernel_require.rb:92:in `require': cannot load such file -- sass-listen (LoadError)
Что это за ошибка??

[ogost]

судя по гуглу нужен пакет ruby-listen