Module 'ngRoute' is not available! You either misspelled the module name or forgot to load it

I am using Ruby on rails with ruby 2.3.1p112 ,Rails 4.2.6

1. In my gem file I have included both: gem 'jquery-rails'
                                        gem 'angularjs-rails'
2.Inside application.js included: //= require angular
                                 //= require angular-resource

But have error on browser : Module 'ngRoute' is not available! You either misspelled the module name or forgot to load it

When I try to use ngRoute