我的Heroku应用程序中导致这些错误的原因是什么？
的信息：
Heroku stack：bamboo-mri-1.9.2
我的gemfile中有gem 'rake', '0.8.7'。
错误1：
2011-05-31T01:49:34+00:00 heroku[worker.2]: Stopping process with SIGTERM
2011-05-31T01:49:34+00:00 app[worker.2]: rake aborted!
2011-05-31T01:49:34+00:00 app[worker.2]: SIGTERM
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `block in require'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `block in load_dependency'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:591:in `new_constants_in'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `load_dependency'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/core_ext.rb:2:in `block in <top (required)>'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/core_ext.rb:1:in `each'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/core_ext.rb:1:in `<top (required)>'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `block in require'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `block in load_dependency'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:591:in `new_constants_in'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `load_dependency'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/all.rb:3:in `<top (required)>'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `block in require'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `block in load_dependency'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:591:in `new_constants_in'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `load_dependency'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application/bootstrap.rb:16:in `block in <module:Bootstrap>'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:25:in `instance_exec'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:25:in `run'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:50:in `block in run_initializers'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:49:in `each'
2011-05-31T01:49:34+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:49:in `run_initializers'
2011-05-31T01:49:34+00:00 heroku[worker.2]: Process exited
错误2：
2011-05-31T02:16:25+00:00 heroku[worker.2]: Starting process with command: `rake jobs:work`
2011-05-31T02:16:25+00:00 app[worker.2]: (in /app)
2011-05-31T02:16:28+00:00 heroku[worker.2]: Stopping process with SIGTERM
2011-05-31T02:16:28+00:00 app[worker.2]: rake aborted!
2011-05-31T02:16:28+00:00 app[worker.2]: SIGTERM
2011-05-31T02:16:28+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/devise-1.1.5/lib/devise.rb:2:in `require'
2011-05-31T02:16:28+00:00 app[worker.2]: /app/.bundle/gems/ruby/1.9.1/gems/devise-1.1.5/lib/devise.rb:2:in `<top (required)>'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/runtime.rb:64:in `require'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/runtime.rb:64:in `block (2 levels) in require'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/runtime.rb:62:in `each'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/runtime.rb:62:in `block in require'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/runtime.rb:51:in `each'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler/runtime.rb:51:in `require'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/lib/ruby/gems/1.9.1/gems/bundler-1.0.7/lib/bundler.rb:112:in `require'
2011-05-31T02:16:28+00:00 app[worker.2]: /app/config/application.rb:7:in `<top (required)>'
2011-05-31T02:16:28+00:00 app[worker.2]: <internal:lib/rubygems/custom_require>:29:in `require'
2011-05-31T02:16:28+00:00 app[worker.2]: <internal:lib/rubygems/custom_require>:29:in `require'
2011-05-31T02:16:28+00:00 app[worker.2]: /app/Rakefile:4:in `<top (required)>'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2373:in `load'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2373:in `raw_load_rakefile'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2007:in `block in load_rakefile'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2058:in `standard_exception_handling'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2006:in `load_rakefile'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:1991:in `run'
2011-05-31T02:16:28+00:00 app[worker.2]: /usr/ruby1.9.2/bin/rake:31:in `<main>'
2011-05-31T02:16:28+00:00 heroku[worker.2]: Process exited