[Solved] How do I fix Rails RuntimeError Current ExectJ doesn’t support ES5?

Question

The main problem was in your Gemfile here

gem 'therubyracer', platforms: :ruby
gem 'mini_racer', platforms: :ruby

You had two racer type gems, you only need one.

You should just use gem 'mini_racer' and get rid of therubyracer. Do that and run bundle install. You will also need to clean up merge conflict stuff left in your routes.rb file. Do that before bundle install and you should be good.

You probably also don’t need to lock your gem versions until you have a more developed and stable stack. You might as well upgrade everything early on since some of the versions you have our out of date. To upgrade your gems just remove all the version stuff after each gem line i.e.

gem 'coffee-rails', '~> 4.2'

can just be

gem 'coffee-rails'

After removing them all, then run

bundle update

Here is a patchfile which will do these things in case you have a problem. You can save this locally and then just run git apply fix_gem_dependancies.patch if you like.

UPDATE LAST ONE: This is the last thing I’m doing on this. Get rid of gems you don’t need, just use this Gemfile

source 'https://rubygems.org'

gem 'rails', '~> 5.1.3'
gem 'sqlite3'
gem 'puma', '~> 3.7'
gem 'sass-rails'
gem 'uglifier'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder'
gem 'sdoc'

gem 'autoprefixer-rails'

gem 'execjs'

gem 'materialize-sass'


group :development, :test do
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
  gem 'capybara', '~> 2.13'
  gem 'selenium-webdriver'
end

group :development do
  gem 'web-console', '>= 3.3.0'
end

gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

The patch I sent you should have fixed the routes but you obviously don’t know what you’re doing with git. So here is your routes.rb file

Rails.application.routes.draw do

  root 'pages#home'

  get 'about' => 'pages#about'

  # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end

Accepted Answer