当我将我的项目推送到Heroku，我使用PostgreSQL作为数据库时，我收到一个错误：
抱歉出了问题。
然后我跑：
heroku run rake db:migrate
我收到了这些错误：
heroku run rake db:migrate
Running `rake db:migrate` attached to terminal... up, run.6196
DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has- been-released. (called from <top (required)> at /app/Rakefile:7)
DEPRECATION WARNING: You have Rails 2.3-style plugins in vendor/plugins! Support for these plugins will be removed in Rails 4.0. Move them out and bundle them in your Gemfile, or fold them in to your app as lib/myplugin/* and config/initializers/myplugin.rb. See the release notes
for more on this: http://weblog.rubyonrails.org/2012/1/4/rails-3-2-0-rc2-has-been-released (called from <top (required)> at /app/Rakefile:7)
Connecting to database specified by DATABASE_URL
Migrating to CreateProducts (20130714042819)