Bootstrap 4: Uncaught ReferenceError: Popper is not defined

Question

I\'ve installed Bootstrap 4 using Node and Gulp and when running the application I get the following error

Uncaught ReferenceError: Popper is not def

Answer 1

I had the same. I'm on Rails and i followed bootstrap 4 gem installation from https://github.com/twbs/bootstrap-rubygem. I just make popper requirement in application.js first, like this :

//= require popper
//= require jquery3
//= require jquery_ujs
//= require bootstrap-sprockets
//= require bootstrap