error

rails server -e development
/home/jeff/.rvm/gems/ruby-2.2.6/gems/fog-core-1.22.0/lib/fog/core/collection.rb:148: warning: circular argument reference - filters
/home/jeff/.rvm/gems/ruby-2.2.6/gems/fog-1.22.0/lib/fog/rackspace/mock_data.rb:43: warning: duplicated key at line 81 ignored: "name"
=> Booting WEBrick
=> Rails 4.2.10 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
Exiting
/home/jeff/.rvm/gems/ruby-2.2.6/gems/activerecord-4.2.10/lib/active_record/connection_adapters/connection_specification.rb:177:in `rescue in spec': Specified 'postgresql' for database adapter, but the gem is not loaded. Add `gem 'pg'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord). (Gem::LoadError)
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/activerecord-4.2.10/lib/active_record/connection_adapters/connection_specification.rb:174:in `spec'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/activerecord-4.2.10/lib/active_record/connection_handling.rb:50:in `establish_connection'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/activerecord-4.2.10/lib/active_record/railtie.rb:122:in `block (2 levels) in <class:Railtie>'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.10/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.10/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.10/lib/active_support/lazy_load_hooks.rb:28:in `block in on_load'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.10/lib/active_support/lazy_load_hooks.rb:27:in `each'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.10/lib/active_support/lazy_load_hooks.rb:27:in `on_load'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/activerecord-4.2.10/lib/active_record/railtie.rb:118:in `block in <class:Railtie>'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/initializable.rb:30:in `instance_exec'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/initializable.rb:30:in `run'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/initializable.rb:55:in `block in run_initializers'
	from /home/jeff/.rvm/rubies/ruby-2.2.6/lib/ruby/2.2.0/tsort.rb:226:in `block in tsort_each'
	from /home/jeff/.rvm/rubies/ruby-2.2.6/lib/ruby/2.2.0/tsort.rb:348:in `block (2 levels) in each_strongly_connected_component'
	from /home/jeff/.rvm/rubies/ruby-2.2.6/lib/ruby/2.2.0/tsort.rb:429:in `each_strongly_connected_component_from'
	from /home/jeff/.rvm/rubies/ruby-2.2.6/lib/ruby/2.2.0/tsort.rb:347:in `block in each_strongly_connected_component'
	from /home/jeff/.rvm/rubies/ruby-2.2.6/lib/ruby/2.2.0/tsort.rb:345:in `each'
	from /home/jeff/.rvm/rubies/ruby-2.2.6/lib/ruby/2.2.0/tsort.rb:345:in `call'
	from /home/jeff/.rvm/rubies/ruby-2.2.6/lib/ruby/2.2.0/tsort.rb:345:in `each_strongly_connected_component'
	from /home/jeff/.rvm/rubies/ruby-2.2.6/lib/ruby/2.2.0/tsort.rb:224:in `tsort_each'
	from /home/jeff/.rvm/rubies/ruby-2.2.6/lib/ruby/2.2.0/tsort.rb:203:in `tsort_each'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/initializable.rb:54:in `run_initializers'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/application.rb:352:in `initialize!'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/railtie.rb:194:in `public_send'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/railtie.rb:194:in `method_missing'
	from /home/jeff/Projetos/beved/config/environment.rb:8:in `<top (required)>'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.10/lib/active_support/dependencies.rb:274:in `require'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.10/lib/active_support/dependencies.rb:274:in `block in require'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.10/lib/active_support/dependencies.rb:240:in `load_dependency'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/activesupport-4.2.10/lib/active_support/dependencies.rb:274:in `require'
	from /home/jeff/Projetos/beved/config.ru:3:in `block in <main>'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/rack-1.6.10/lib/rack/builder.rb:55:in `instance_eval'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/rack-1.6.10/lib/rack/builder.rb:55:in `initialize'
	from /home/jeff/Projetos/beved/config.ru:in `new'
	from /home/jeff/Projetos/beved/config.ru:in `<main>'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/rack-1.6.10/lib/rack/builder.rb:49:in `eval'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/rack-1.6.10/lib/rack/builder.rb:49:in `new_from_string'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/rack-1.6.10/lib/rack/builder.rb:40:in `parse_file'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/rack-1.6.10/lib/rack/server.rb:300:in `build_app_and_options_from_config'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/rack-1.6.10/lib/rack/server.rb:209:in `app'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/commands/server.rb:61:in `app'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/rack-1.6.10/lib/rack/server.rb:337:in `wrapped_app'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/commands/server.rb:139:in `log_to_stdout'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/commands/server.rb:78:in `start'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/commands/commands_tasks.rb:80:in `block in server'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/commands/commands_tasks.rb:75:in `tap'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/commands/commands_tasks.rb:75:in `server'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
	from /home/jeff/.rvm/gems/ruby-2.2.6/gems/railties-4.2.10/lib/rails/commands.rb:17:in `<top (required)>'
	from script/rails:35:in `require'
	from script/rails:35:in `<main>'