我在为某人开发的快速应用程序上使用了 Rails 应用程序模板。它通过 RVM 安装了一个新的 Ruby 版本，一切都很好。我已将其推送到 Github，并且可以通过 Heroku 提供服务。
当我尝试更新它时，问题就来了。我正在使用它安装的正确 Ruby 版本，但是当我在本地启动服务器时，我收到一个错误，我认为这与 Ruby 版本问题有关。
/Users/tomallen/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych.rb:203:in `parse': (<unknown>): found character that cannot start any token while scanning for the next token at line 2 column 1 (Psych::SyntaxError)
from /Users/tomallen/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych.rb:203:in `parse_stream'
from /Users/tomallen/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych.rb:151:in `parse'
from /Users/tomallen/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/psych.rb:127:in `load'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/application/configuration.rb:115:in `database_configuration'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/railtie.rb:78:in `block (2 levels) in <class:Railtie>'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/lazy_load_hooks.rb:26:in `block in on_load'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/lazy_load_hooks.rb:25:in `each'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/lazy_load_hooks.rb:25:in `on_load'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/railtie.rb:74:in `block in <class:Railtie>'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/initializable.rb:30:in `instance_exec'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/initializable.rb:30:in `run'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/initializable.rb:55:in `block in run_initializers'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/initializable.rb:54:in `each'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/initializable.rb:54:in `run_initializers'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/application.rb:136:in `initialize!'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/railtie/configurable.rb:30:in `method_missing'
from /Users/tomallen/Documents/Sites/videoapp/config/environment.rb:5:in `<top (required)>'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `block in require'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:251:in `require'
from /Users/tomallen/Documents/Sites/videoapp/config.ru:4:in `block in <main>'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/builder.rb:51:in `instance_eval'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/builder.rb:51:in `initialize'
from /Users/tomallen/Documents/Sites/videoapp/config.ru:1:in `new'
from /Users/tomallen/Documents/Sites/videoapp/config.ru:1:in `<main>'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/builder.rb:40:in `eval'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/builder.rb:40:in `parse_file'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:200:in `app'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands/server.rb:46:in `app'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:301:in `wrapped_app'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/rack-1.4.1/lib/rack/server.rb:252:in `start'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands/server.rb:70:in `start'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands.rb:55:in `block in <top (required)>'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands.rb:50:in `tap'
from /Users/tomallen/.rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands.rb:50:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
有什么想法可能导致这种情况吗？