luo@ming:~/PianoServer$ rails s
/home/luo/.rvm/rubies/ruby-2.2-head/lib/ruby/2.2.0/psych.rb:370:in `parse': (<unknown>): could not find expected ':' while scanning a simple key at line 5 column 3 (Psych::SyntaxError)
from /home/luo/.rvm/rubies/ruby-2.2-head/lib/ruby/2.2.0/psych.rb:370:in `parse_stream'
from /home/luo/.rvm/rubies/ruby-2.2-head/lib/ruby/2.2.0/psych.rb:318:in `parse'
from /home/luo/.rvm/rubies/ruby-2.2-head/lib/ruby/2.2.0/psych.rb:245:in `load'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config/sources/yaml_source.rb:17:in `load'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config/options.rb:40:in `block in reload!'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config/options.rb:39:in `each'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config/options.rb:39:in `reload!'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config.rb:32:in `load_files'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config.rb:40:in `load_and_set_settings'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config/integration/rails.rb:17:in `block in <class:Railtie>'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:36:in `call'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:45:in `block in run_load_hooks'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:44:in `each'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:44:in `run_load_hooks'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/application.rb:147:in `run_load_hooks!'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/application.rb:95:in `instance'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/railtie.rb:123:in `config'
from /home/luo/PianoServer/config/application.rb:25:in `<class:Application>'
from /home/luo/PianoServer/config/application.rb:10:in `<module:PianoServer>'
from /home/luo/PianoServer/config/application.rb:9:in `<top (required)>'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:78:in `require'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:78:in `block in server'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `tap'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `server'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>'
from /home/luo/PianoServer/bin/rails:8:in `require'
from /home/luo/PianoServer/bin/rails:8:in `<top (required)>'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/lib/spring/client/rails.rb:28:in `load'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/lib/spring/client/rails.rb:28:in `call'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/lib/spring/client/command.rb:7:in `call'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/lib/spring/client.rb:26:in `run'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/bin/spring:48:in `<top (required)>'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/lib/spring/binstub.rb:11:in `load'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/lib/spring/binstub.rb:11:in `<top (required)>'
from /home/luo/.rvm/rubies/ruby-2.2-head/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from /home/luo/.rvm/rubies/ruby-2.2-head/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from /home/luo/PianoServer/bin/spring:13:in `<top (required)>'
from bin/rails:3:in `load'
from bin/rails:3:in `<main>'
/home/luo/.rvm/rubies/ruby-2.2-head/lib/ruby/2.2.0/psych.rb:370:in `parse': (<unknown>): could not find expected ':' while scanning a simple key at line 5 column 3 (Psych::SyntaxError)
from /home/luo/.rvm/rubies/ruby-2.2-head/lib/ruby/2.2.0/psych.rb:370:in `parse_stream'
from /home/luo/.rvm/rubies/ruby-2.2-head/lib/ruby/2.2.0/psych.rb:318:in `parse'
from /home/luo/.rvm/rubies/ruby-2.2-head/lib/ruby/2.2.0/psych.rb:245:in `load'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config/sources/yaml_source.rb:17:in `load'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config/options.rb:40:in `block in reload!'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config/options.rb:39:in `each'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config/options.rb:39:in `reload!'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config.rb:32:in `load_files'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config.rb:40:in `load_and_set_settings'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/rails_config-0.4.2/lib/rails_config/integration/rails.rb:17:in `block in <class:Railtie>'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:36:in `call'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:45:in `block in run_load_hooks'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:44:in `each'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/activesupport-4.2.0/lib/active_support/lazy_load_hooks.rb:44:in `run_load_hooks'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/application.rb:147:in `run_load_hooks!'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/application.rb:95:in `instance'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/railtie.rb:123:in `config'
from /home/luo/PianoServer/config/application.rb:25:in `<class:Application>'
from /home/luo/PianoServer/config/application.rb:10:in `<module:PianoServer>'
from /home/luo/PianoServer/config/application.rb:9:in `<top (required)>'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:78:in `require'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:78:in `block in server'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `tap'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:75:in `server'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>'
from /home/luo/PianoServer/bin/rails:8:in `require'
from /home/luo/PianoServer/bin/rails:8:in `<top (required)>'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/lib/spring/client/rails.rb:28:in `load'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/lib/spring/client/rails.rb:28:in `call'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/lib/spring/client/command.rb:7:in `call'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/lib/spring/client.rb:26:in `run'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/bin/spring:48:in `<top (required)>'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/lib/spring/binstub.rb:11:in `load'
from /home/luo/.rvm/gems/ruby-2.2-head/gems/spring-1.3.6/lib/spring/binstub.rb:11:in `<top (required)>'
from /home/luo/.rvm/rubies/ruby-2.2-head/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from /home/luo/.rvm/rubies/ruby-2.2-head/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
from /home/luo/PianoServer/bin/spring:13:in `<top (required)>'
from bin/rails:3:in `load'
from bin/rails:3:in `<main>'
