Rails 4 & Ruby 1.9 error generating mongoid:config - ruby-on-rails

Question

I'm trying to create a ruby on rails app which can be hosted on Openshift, but i encounter the following error when i try to use the rails g mongoid:config command through terminal. I've tried everything i found on stackoverflow but the error still persists! what am i doing wrong?
here is the error:
/home/themis/.rvm/gems/ruby-2.3.0/gems/activesupport-4.0.3/lib/active_support/values/time_zone.rb:282: warning: circular argument reference - now
/home/themis/rails4/config/application.rb:6:in `require': cannot load such file -- active_job/railtie (LoadError)
from /home/themis/rails4/config/application.rb:6:in `<top (required)>'
from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:82:in `require'
from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:82:in `preload'
from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:143:in `serve'
from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:131:in `block in run'
from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:125:in `loop'
from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application.rb:125:in `run'
from /home/themis/.rvm/gems/ruby-2.3.0/gems/spring-1.7.2/lib/spring/application/boot.rb:19:in `<top (required)>'
from /home/themis/.rvm/rubies/ruby-2.3.0/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /home/themis/.rvm/rubies/ruby-2.3.0/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from -e:1:in `<main>'
and my Gemfile
source 'https://rubygems.org'
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.0.3'
gem 'mongoid', git: 'https://github.com/mongoid/mongoid.git'
gem 'twitter-bootstrap-rails'
gem 'less-rails'
# Use Puma as the app server
gem 'puma', '~> 3.0'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# See https://github.com/rails/execjs#readme for more supported runtimes
gem 'therubyracer', platforms: :ruby
# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
gem "rspec"
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 3.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'byebug', platform: :mri
end
group :development do
# Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
gem 'web-console'
gem 'listen', '~> 3.0.5'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
gem 'spring-watcher-listen', '~> 2.0.0'
end
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

Answer 1

This is an ActiveSupport bug (thus a Rails bug).
Line 282 at activesupport-4.0.3/lib/active_support/values/time_zone.rb is
def parse(str, now=now)
# ...
end
And line 308 of the same file is
def now
# ...
end
The problem is at the default param now=now, which ruby struggles to understand whether the latter now is a method call or is just a local variable (the param itself).
If you modify the now=now to now=now(), then all is fine.
This bug is fixed in Rails 4.0.6.