title: Ruby 2.4 and Rails 4 stack level too deep (SystemStackError)
body: <p>I'm trying to run newly created project in Rails 4.0.8 but I receive and error: </p>
  
  <pre><code>    rails s
  =&gt; Booting WEBrick
  =&gt; Rails 4.0.8 application starting in development on http://0.0.0.0:3000
  =&gt; Run `rails server -h` for more startup options
  =&gt; Ctrl-C to shutdown server
  /usr/local/lib/ruby/gems/2.4.0/gems/activesupport-4.0.8/lib/active_support/core_ext/numeric/conversions.rb:121: warning: constant ::Fixnum is deprecated
  /usr/local/lib/ruby/gems/2.4.0/gems/activesupport-4.0.8/lib/active_support/core_ext/numeric/conversions.rb:121: warning: constant ::Bignum is deprecated
  Exiting
  /usr/local/lib/ruby/gems/2.4.0/gems/activesupport-4.0.8/lib/active_support/core_ext/numeric/conversions.rb:124:in `block (2 levels) in &lt;class:Numeric&gt;': stack level too deep (SystemStackError)
      from /usr/local/lib/ruby/gems/2.4.0/gems/activesupport-4.0.8/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in &lt;class:Numeric&gt;'
      from /usr/local/lib/ruby/gems/2.4.0/gems/activesupport-4.0.8/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in &lt;class:Numeric&gt;'
      from /usr/local/lib/ruby/gems/2.4.0/gems/activesupport-4.0.8/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in &lt;class:Numeric&gt;'
      from /usr/local/lib/ruby/gems/2.4.0/gems/activesupport-4.0.8/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in &lt;class:Numeric&gt;'
      from /usr/local/lib/ruby/gems/2.4.0/gems/activesupport-4.0.8/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in &lt;class:Numeric&gt;'
      from /usr/local/lib/ruby/gems/2.4.0/gems/activesupport-4.0.8/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in &lt;class:Numeric&gt;'
      from /usr/local/lib/ruby/gems/2.4.0/gems/activesupport-4.0.8/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in &lt;class:Numeric&gt;'
      from /usr/local/lib/ruby/gems/2.4.0/gems/activesupport-4.0.8/lib/active_support/core_ext/numeric/conversions.rb:131:in `block (2 levels) in &lt;class:Numeric&gt;'
       ... 5532 levels...
      from /usr/local/lib/ruby/gems/2.4.0/gems/railties-4.0.8/lib/rails/commands.rb:71:in `tap'
      from /usr/local/lib/ruby/gems/2.4.0/gems/railties-4.0.8/lib/rails/commands.rb:71:in `&lt;top (required)&gt;'
      from bin/rails:4:in `require'
      from bin/rails:4:in `&lt;main&gt;'
  </code></pre>
  
  <p>Ruby version:</p>
  
  <pre><code>Rails 4.0.8
  </code></pre>
  
  <p>My Gemefile:</p>
  
  <pre><code>source 'https://rubygems.org'
  
  # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
  gem 'rails', '4.0.8'
  
  # Use sqlite3 as the database for Active Record
  gem 'sqlite3'
  
  # Use SCSS for stylesheets
  gem 'sass-rails', '~&gt; 4.0.2'
  
  # Use Uglifier as compressor for JavaScript assets
  gem 'uglifier', '&gt;= 1.3.0'
  
  # Use CoffeeScript for .js.coffee assets and views
  gem 'coffee-rails', '~&gt; 4.0.0'
  
  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  # gem 'therubyracer', platforms: :ruby
  
  # Use jquery as the JavaScript library
  gem 'jquery-rails'
  
  # Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
  gem 'turbolinks'
  
  # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
  gem 'jbuilder', '~&gt; 1.2'
  gem 'json', github: 'flori/json', branch: 'v1.8'
  group :doc do
    # bundle exec rake doc:rails generates the API under doc/api.
    gem 'sdoc', require: false
  end
  </code></pre>
  
  <p>I tried to reinstall rails because before I have 5.0 Rails installed on my machine.</p>
  
  <p>Local gems:</p>
  
  <pre><code>*** LOCAL GEMS ***
  
  autoprefixer-rails (6.6.0)
  coffee-rails (4.2.1, 4.0.1)
  font-awesome-rails (4.7.0.1)
  jquery-atwho-rails (1.3.2)
  jquery-rails (4.2.2, 3.1.4)
  rails (4.0.8, 4.0.0)
  rails-dom-testing (2.0.2)
  rails-html-sanitizer (1.0.3)
  rails_12factor (0.0.3)
  rails_serve_static_assets (0.0.5)
  rails_stdout_logging (0.0.5)
  sass-rails (5.0.6, 4.0.5)
  sprockets-rails (3.2.0, 2.3.3, 2.0.1)
  </code></pre>
  
  <p>Meybe unistall: ruby and rails will solve this problem, but I dont want to do that. Beasically I whant to have installed both version of rails, for exampole: rails 4 and rails 5 as well. Is that configuration possible ?</p>