ruby-on-rails – 即使在开发环境中,Rails环境看起来仍然停留在

/Users/atestu/.rvm/gems/ruby-1.9.3-p125@global/gems/activesupport-3.2.1/lib/active_support/dependencies.rb:251:in `require': Please install the tcp adapter: `gem install activerecord-tcp-adapter` (cannot load such file -- active_record/connection_adapters/tcp_adapter) (LoadError)

我想这个gem与heroku的生产环境有关,但是我的RAILS_ENV变量是空的.当我将它设置为开发或运行rails s -e开发时,我得到完全相同的问题.

我怎样才能更深入地研究这个问题？

编辑：这是我的Gemfile：

source 'http://rubygems.org'

gem 'rails','3.2.1'
gem 'json'
gem 'jquery-rails'
gem 'authlogic'
gem 'acts-as-taggable-on'
gem 'rpx_now'
gem 'hominid'
gem 'ruby-tmdb'
gem 'memcached'
gem 'aws-s3'

group :assets do
? gem 'sass-rails'
? gem 'coffee-rails'
? gem 'uglifier'
end

group :production do
? gem 'heroku'
? gem 'pg'
end

group :development,:test do
? gem 'sqlite3'
? gem 'taps'
end

这是我的database.yml文件：

# SQLite version 3.x
#   gem install sqlite3
#
#   Ensure the SQLite 3 gem is defined in your Gemfile
#   gem 'sqlite3'
development:
  adapter: sqlite3
  database: db/development.sqlite3
  pool: 5
  timeout: 5000

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  adapter: sqlite3
  database: db/test.sqlite3
  pool: 5
  timeout: 5000

production:
  adapter: sqlite3
  database: db/production.sqlite3
  pool: 5
  timeout: 5000