Rails-4, ExecJS::ProgramError in Pages#welcome

Question

I am trying to add login-logout functionality to my rails app. For that I added bcrypt gem for password encryption and also access controller. Now when I run it

Answer 1

uncomment (app/assets/javascripts/application.js)

//=  require jquery
//=  require jquery_ujs
//=  require turbolinks
//=  require_tree .