I'm tried to deploy a new version of my app to heroku. The deployment fails because heroku says, that the gem pg is not in my GEMFILE ... I have this postgres gem in my GEMFILE. I also looked for some answers, but no one worked ... As anyone an idea?

I use Ruby 2.0.0p247, Rails 3.2.14 refinery-cms 2.1.0

Here is my Gemfile:

```
source 'https://rubygems.org'
ruby '2.0.0'

gem 'rails'
gem 'newrelic_rpm'

group :production do
  gem 'pg'
  gem 'fog'
end

# Gems used only for assets and not required
# in production environments by default.
group :assets do
  gem 'sass-rails'
  gem 'coffee-rails'

  # See https://github.com/sstephenson/execjs#readme for more supported runtimes
  # gem 'therubyracer', :platforms => :ruby

  gem 'uglifier', '>= 1.0.3'
end

gem 'jquery-rails'

# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby'

# To use Jbuilder templates for JSON
 gem 'jbuilder'

# Use unicorn as the app server
 gem 'unicorn'

# Deploy with Capistrano
 gem 'capistrano'

# To use debugger
 gem 'debugger'

# The Heroku gem allows you to interface with Heroku's API
gem 'heroku'

# Fog allows you to use S3 assets (added for Heroku)
gem 'fog'

# Postgres support (added for Heroku)
#gem 'pg'

#Connecting to Amazon S3
gem 'aws-s3'
#gem 'taps'

# Refinery CMS
#gem 'refinerycms', '~> 2.0.0', :git => 'git://github.com/refinery/refinerycms.git', :branch => '2-0-stable'
gem 'refinerycms'

# Specify additional Refinery CMS Extensions here (all optional):
gem 'refinerycms-i18n'
#  gem 'refinerycms-blog', '~> 2.0.0'
#  gem 'refinerycms-inquiries', '~> 2.0.0'
#  gem 'refinerycms-search', '~> 2.0.0'
gem 'refinerycms-page-images'

gem 'refinerycms-announcements', :path => 'vendor/extensions'
gem 'refinerycms-publications', :path => 'vendor/extensions'
gem 'refinerycms-workers', :path => 'vendor/extensions'

```

And here the error message:

```
-----> Writing config/database.yml to read from DATABASE_URL
-----> Preparing app for Rails asset pipeline
       Running: rake assets:precompile
       rake aborted!
       Please install the postgresql adapter: `gem install activerecord-postgresql-adapter` (pg is not part of the bundle. Add it to Gemfile.)
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/bundler-1.3.2/lib/bundler/rubygems_integration.rb:214:in `block in replace_gem'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.14/lib/active_record/connection_adapters/postgresql_adapter.rb:7:in `<top (required)>'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `require'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `block in require'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:236:in `load_dependency'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `require'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.14/lib/active_record/connection_adapters/abstract/connection_specification.rb:50:in `resolve_hash_connection'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.14/lib/active_record/connection_adapters/abstract/connection_specification.rb:41:in `resolve_string_connection'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.14/lib/active_record/connection_adapters/abstract/connection_specification.rb:27:in `spec'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.14/lib/active_record/connection_adapters/abstract/connection_specification.rb:130:in `establish_connection'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.14/lib/active_record/railtie.rb:88:in `block (2 levels) in <class:Railtie>'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.14/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.14/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.14/lib/active_support/lazy_load_hooks.rb:26:in `block in on_load'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.14/lib/active_support/lazy_load_hooks.rb:25:in `each'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.14/lib/active_support/lazy_load_hooks.rb:25:in `on_load'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activerecord-3.2.14/lib/active_record/railtie.rb:80:in `block in <class:Railtie>'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/railties-3.2.14/lib/rails/initializable.rb:30:in `instance_exec'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/railties-3.2.14/lib/rails/initializable.rb:30:in `run'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/railties-3.2.14/lib/rails/initializable.rb:55:in `block in run_initializers'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/railties-3.2.14/lib/rails/initializable.rb:54:in `each'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/railties-3.2.14/lib/rails/initializable.rb:54:in `run_initializers'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/railties-3.2.14/lib/rails/application.rb:136:in `initialize!'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/railties-3.2.14/lib/rails/railtie/configurable.rb:30:in `method_missing'
       /tmp/build_37zyls4tcoz59/config/environment.rb:5:in `<top (required)>'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `require'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `block in require'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:236:in `load_dependency'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/activesupport-3.2.14/lib/active_support/dependencies.rb:251:in `require'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/railties-3.2.14/lib/rails/application.rb:103:in `require_environment!'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/railties-3.2.14/lib/rails/application.rb:305:in `block (2 levels) in initialize_tasks'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/actionpack-3.2.14/lib/sprockets/assets.rake:93:in `block (2 levels) in <top (required)>'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/actionpack-3.2.14/lib/sprockets/assets.rake:60:in `block (3 levels) in <top (required)>'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/actionpack-3.2.14/lib/sprockets/assets.rake:23:in `invoke_or_reboot_rake_task'
       /tmp/build_37zyls4tcoz59/vendor/bundle/ruby/2.0.0/gems/actionpack-3.2.14/lib/sprockets/assets.rake:29:in `block (2 levels) in <top (required)>'
       Tasks: TOP => environment
       (See full trace by running task with --trace)
       Precompiling assets failed, enabling runtime asset compilation
       Injecting rails31_enable_runtime_asset_compilation
       Please see this article for troubleshooting help:
       http://devcenter.heroku.com/articles/rails31_heroku_cedar#troubleshooting

```
['https://Stackoverflow.com/questions/18274428', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/1458773/']
The problem is that you have the pg gem in the production group. Therefore when assets are precompiled on Heroku (which uses the global group + assets group) then the PG gem cannot indeed be found because it's in the production group.

I would suggest having the pg gem in the global group and available to allow asset groups.
Oh no ... the solution was to delete my git repo and create a new one. I don't know why, but my repo got messed up (I added new files and so on ..) and so it didn't commit all data. After the tip of chucknelson I tried to lock a certain rails version and saw that heroku didn't get this.