我正在尝试在Heroku中创建一个Rails应用程序。我在本地运行（nitrous.io）并且工作正常。我不知道这里发生了什么，也不知道我做错了什么。我已经在SO上阅读了许多其他答案，但似乎没有一个对我有用。我希望有人有这方面的经验，可以帮助我！
按照here的说明我已经添加了这个：
#config/application.rb
config.serve_static_assets = true
#Gemfile
gem 'rails_12factor', group: :production
-----> Preparing app for Rails asset pipeline
Running: rake assets:precompile
rake aborted!
IndexError: string not matched
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.0/lib/active_record/connection_handling.rb:76:in `[]='
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.0/lib/active_record/connection_handling.rb:76:in `block in config'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.0/lib/active_record/connection_handling.rb:74:in `tap'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.0/lib/active_record/connection_handling.rb:74:in `config'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.0/lib/active_record/connection_handling.rb:69:in `resolve'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.0/lib/active_record/core.rb:46:in `configurations='
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.0/lib/active_record/railtie.rb:128:in `block (2 levels) in <class:Railtie>'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:38:in `instance_eval'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:38:in `execute_hook'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:28:in `block in on_load'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:27:in `each'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.0/lib/active_support/lazy_load_hooks.rb:27:in `on_load'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.0/lib/active_record/railtie.rb:118:in `block in <class:Railtie>'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/railties-4.1.0/lib/rails/initializable.rb:30:in `instance_exec'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/railties-4.1.0/lib/rails/initializable.rb:30:in `run'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/railties-4.1.0/lib/rails/initializable.rb:55:in `block in run_initializers'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/railties-4.1.0/lib/rails/initializable.rb:54:in `run_initializers'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/railties-4.1.0/lib/rails/application.rb:288:in `initialize!'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/railties-4.1.0/lib/rails/railtie.rb:194:in `public_send'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/railties-4.1.0/lib/rails/railtie.rb:194:in `method_missing'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/config/environment.rb:5:in `<top (required)>'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `require'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `block in require'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:232:in `load_dependency'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:247:in `require'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/railties-4.1.0/lib/rails/application.rb:264:in `require_environment!'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/railties-4.1.0/lib/rails/application.rb:367:in `block in run_tasks_blocks'
/tmp/build_5191aa8d-0f78-44fd-a9ad-b6620c655951/vendor/bundle/ruby/2.1.0/gems/sprockets-rails-2.1.3/lib/sprockets/rails/task.rb:55:in `block (2 levels) in define'
Tasks: TOP => environment
(See full trace by running task with --trace)
! Precompiling assets failed.
! Push rejected, failed to compile Ruby app
答案 0 :(得分：1)
IndexError: string not matched
表示某个字符串作为哈希被访问。例如
@name = 'John'
@name['b'] => will throw this error
看看你的配置文件，它似乎停在那里。