Application error, undefined symbol: rb_thread_select

Question

I have an RoR application everything was working fine until I deployed to heroku where I get the "Application Error" and on the logs "undefined symbol: rb_thread_select", I'm using "ruby 2.3.0p0", "Rails 4.2.5" gem 'pg', '0.18.4', any ideas how to fix it?

source 'https://rubygems.org'


gem 'rails', '4.2.5'
gem 'pg', '0.18.4'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.1.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0', group: :doc

gem 'foundation-rails'

gem "paperclip", "~> 5.0.0"

gem 'devise'

gem 'redis', '~> 3.0.1'
gem 'hiredis', '~> 0.4.5'

# gem 'bcrypt', '~> 3.1.7'

# gem 'unicorn'

# gem 'capistrano-rails', group: :development

group :development, :test do
console
  gem 'byebug'
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console', '~> 2.0'

background. Read more: https://github.com/rails/spring
  gem 'spring'
end

Answer 1

source 'https://rubygems.org'

ruby '2.3.0'


gem 'rails', '4.2.5'
gem 'sass-rails', '~> 5.0'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.1.0'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0', group: :doc

gem 'foundation-rails'

gem "paperclip", "~> 5.0.0"

gem 'devise'

gem 'redis', '~> 3.0.1'
gem 'hiredis', '~> 0.4.5'

# gem 'bcrypt', '~> 3.1.7'

# gem 'unicorn'

# gem 'capistrano-rails', group: :development

group :development, :test do
console
  gem 'byebug'
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console', '~> 2.0'

background. Read more: https://github.com/rails/spring
  gem 'spring'
end

group :production do
 gem 'pg'
 gem 'rails_12factor'
 gem 'puma'
end

Copy and paste this gemfile and run bundle install in your terminal.