レール2.3.5、ルビー1.8.7（2010-08-16パッチレベル302）を使用しています[i386-mingw32]
私はWindowsマシンを使用しています。
プロジェクトには.gemファイルがないため、rake gems：installとrake db：createを使用します。
上記の手順まではすべて正常に機能していますが、
rake db：migrate --traceを実行すると、次のエラーが発生します
** Execute environment
rake aborted!
no such file to load -- rush
D:/programfiles/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`gem_original_require'
D:/programfiles/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_su
pport/dependencies.rb:156:in `require'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_su
pport/dependencies.rb:521:in `new_constants_in'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_su
pport/dependencies.rb:156:in `require'
D:/workspace/ruby/education/fedena2.3inprogress/vendor/plugins/delayed_job/lib/d
elayed/worker.rb:1
D:/programfiles/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`gem_original_require'
D:/programfiles/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_su
pport/dependencies.rb:156:in `require'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_su
pport/dependencies.rb:521:in `new_constants_in'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_su
pport/dependencies.rb:156:in `require'
D:/workspace/ruby/education/fedena2.3inprogress/vendor/plugins/delayed_job/lib/d
elayed_job.rb:6
D:/programfiles/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`gem_original_require'
D:/programfiles/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_su
pport/dependencies.rb:156:in `require'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_su
pport/dependencies.rb:521:in `new_constants_in'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_su
pport/dependencies.rb:156:in `require'
D:/workspace/ruby/education/fedena2.3inprogress/vendor/plugins/delayed_job/init.
rb:1:in `evaluate_init_rb'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/plugin.rb:1
58:in `evaluate_init_rb'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_su
pport/core_ext/kernel/reporting.rb:11:in `silence_warnings'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/plugin.rb:1
54:in `evaluate_init_rb'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/plugin.rb:4
8:in `load'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/plugin/load
er.rb:38:in `load_plugins'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/plugin/load
er.rb:37:in `each'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/rails/plugin/load
er.rb:37:in `load_plugins'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:36
9:in `load_plugins'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:16
5:in `process'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:11
3:in `send'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:11
3:in `run'
D:/workspace/ruby/education/fedena2.3inprogress/config/environment.rb:6
D:/programfiles/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`gem_original_require'
D:/programfiles/Ruby187/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
`require'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_su
pport/dependencies.rb:156:in `require'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_su
pport/dependencies.rb:521:in `new_constants_in'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_su
pport/dependencies.rb:156:in `require'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/tasks/misc.rake:4
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:205
:in `call'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:205
:in `execute'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:200
:in `each'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:200
:in `execute'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:158
:in `invoke_with_call_chain'
D:/programfiles/Ruby187/lib/ruby/1.8/monitor.rb:242:in `synchronize'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:151
:in `invoke_with_call_chain'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:176
:in `invoke_prerequisites'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:174
:in `each'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:174
:in `invoke_prerequisites'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:157
:in `invoke_with_call_chain'
D:/programfiles/Ruby187/lib/ruby/1.8/monitor.rb:242:in `synchronize'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:151
:in `invoke_with_call_chain'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/task.rb:144
:in `invoke'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/application
.rb:116:in `invoke_task'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/application
.rb:94:in `top_level'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/application
.rb:94:in `each'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/application
.rb:94:in `top_level'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/application
.rb:133:in `standard_exception_handling'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/application
.rb:88:in `top_level'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/application
.rb:66:in `run'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/application
.rb:133:in `standard_exception_handling'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/lib/rake/application
.rb:63:in `run'
D:/programfiles/Ruby187/lib/ruby/gems/1.8/gems/rake-0.9.2.2/bin/rake:33
D:/programfiles/Ruby187/bin/rake:19:in `load'
D:/programfiles/Ruby187/bin/rake:19
Tasks: TOP => db:migrate => environment