Installed Glyphicon but still getting errors related

[LucasArruda]

Error in console is:

Safari TypeError: undefined is not an object (evaluating 's(4).Glyphicon')

Chrome Uncaught TypeError: Cannot read property 'Glyphicon' of undefined

Installed gem 'rails-assets-sass-bootstrap-glyphicons' from https://rails-assets.org .

Also using:

gem 'bootstrap-sass'
gem 'sass-rails', '~> 5.0'

Am I doing something wrong. Do I need something or could I not use glyphicons?

Thanks!