So I’m working on my app and everything is great. All tests pass, app

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Asked: May 26, 20262026-05-26T10:19:29+00:00 2026-05-26T10:19:29+00:00

So I’m working on my app and everything is great. All tests pass, app

0

So I’m working on my app and everything is great. All tests pass, app works beautifully. Then, I switch branches without making any changes, switch back, and get this error when I try to run “rails server” again. This has happened a few times now and I have no idea why.

/Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require': no such file to load -- bcrypt_ext (LoadError)
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `block in require'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:591:in `new_constants_in'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/bcrypt-ruby-3.0.1/lib/bcrypt.rb:12:in `<top (required)>'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `block in require'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:591:in `new_constants_in'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/devise-1.4.9/lib/devise/models/database_authenticatable.rb:2:in `<top (required)>'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/devise-1.4.9/lib/devise/models.rb:60:in `const_get'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/devise-1.4.9/lib/devise/models.rb:60:in `block (2 levels) in devise'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/devise-1.4.9/lib/devise/models.rb:59:in `each'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/devise-1.4.9/lib/devise/models.rb:59:in `block in devise'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/devise-1.4.9/lib/devise/models.rb:86:in `devise_modules_hook!'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/devise-1.4.9/lib/devise/models.rb:58:in `devise'
    from /Users/beatjunkie84/Desktop/ProjectX/app/models/user.rb:16:in `<class:User>'
    from /Users/beatjunkie84/Desktop/ProjectX/app/models/user.rb:13:in `<top (required)>'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:454:in `load'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:454:in `block in load_file'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:591:in `new_constants_in'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:453:in `load_file'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:340:in `require_or_load'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:491:in `load_missing_constant'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:183:in `block in const_missing'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:181:in `each'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:181:in `const_missing'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/rake-0.9.2/lib/rake/ext/module.rb:36:in `const_missing'
    from /Users/beatjunkie84/Desktop/ProjectX/app/admin/users.rb:1:in `<top (required)>'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:235:in `load'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:235:in `block in load'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:591:in `new_constants_in'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:235:in `load'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activeadmin-0.3.2/lib/active_admin/application.rb:132:in `block in load!'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activeadmin-0.3.2/lib/active_admin/application.rb:132:in `each'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activeadmin-0.3.2/lib/active_admin/application.rb:132:in `load!'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activeadmin-0.3.2/lib/active_admin/application.rb:155:in `routes'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activeadmin-0.3.2/lib/active_admin.rb:63:in `routes'
    from /Users/beatjunkie84/Desktop/ProjectX/config/routes.rb:4:in `block in <top (required)>'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/actionpack-3.0.1/lib/action_dispatch/routing/route_set.rb:233:in `instance_exec'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/actionpack-3.0.1/lib/action_dispatch/routing/route_set.rb:233:in `draw'
    from /Users/beatjunkie84/Desktop/ProjectX/config/routes.rb:1:in `<top (required)>'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:235:in `load'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:235:in `block in load'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:591:in `new_constants_in'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:235:in `load'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application.rb:127:in `block in reload_routes!'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application.rb:127:in `each'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application.rb:127:in `reload_routes!'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application.rb:120:in `block in routes_reloader'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/file_update_checker.rb:32:in `call'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/file_update_checker.rb:32:in `execute_if_updated'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/actionpack-3.0.1/lib/action_dispatch/railtie.rb:14:in `block (2 levels) in <class:Railtie>'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/callbacks.rb:419:in `_run_prepare_callbacks'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/actionpack-3.0.1/lib/action_dispatch/middleware/callbacks.rb:40:in `initialize'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/actionpack-3.0.1/lib/action_dispatch/middleware/stack.rb:33:in `new'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/actionpack-3.0.1/lib/action_dispatch/middleware/stack.rb:33:in `build'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/actionpack-3.0.1/lib/action_dispatch/middleware/stack.rb:79:in `block in build'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/actionpack-3.0.1/lib/action_dispatch/middleware/stack.rb:79:in `each'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/actionpack-3.0.1/lib/action_dispatch/middleware/stack.rb:79:in `inject'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/actionpack-3.0.1/lib/action_dispatch/middleware/stack.rb:79:in `build'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application.rb:162:in `app'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application/finisher.rb:35:in `block in <module:Finisher>'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:25:in `instance_exec'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:25:in `run'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:50:in `block in run_initializers'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:49:in `each'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/initializable.rb:49:in `run_initializers'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application.rb:134:in `initialize!'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application.rb:77:in `method_missing'
    from /Users/beatjunkie84/Desktop/ProjectX/config/environment.rb:5:in `<top (required)>'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `block in require'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:591:in `new_constants_in'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/dependencies.rb:239:in `require'
    from /Users/beatjunkie84/Desktop/ProjectX/config.ru:3:in `block in <main>'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/rack-1.2.4/lib/rack/builder.rb:46:in `instance_eval'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/rack-1.2.4/lib/rack/builder.rb:46:in `initialize'
    from /Users/beatjunkie84/Desktop/ProjectX/config.ru:1:in `new'
    from /Users/beatjunkie84/Desktop/ProjectX/config.ru:1:in `<main>'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/rack-1.2.4/lib/rack/builder.rb:35:in `eval'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/rack-1.2.4/lib/rack/builder.rb:35:in `parse_file'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/rack-1.2.4/lib/rack/server.rb:162:in `app'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/rack-1.2.4/lib/rack/server.rb:253:in `wrapped_app'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/rack-1.2.4/lib/rack/server.rb:204:in `start'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/commands/server.rb:65:in `start'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/commands.rb:30:in `block in <top (required)>'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/commands.rb:27:in `tap'
    from /Users/beatjunkie84/Desktop/ProjectX/bundler/ruby/1.9.1/gems/railties-3.0.1/lib/rails/commands.rb:27:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

I think i’ve fixed this issue at least 4 times without actually knowing what is causing it or what i did to fix it…what is causing this?

Here is what I do to fix this issue:
1) Checkout the oldest commit I have in my current branch (called ‘paperclip’).
2) Do bundle install (which installs all gems into bundler/ for some reason)
3) Git add . and/or git stash to get rid of the changes I just made to the unnamed branch after checking out
4) Checkout the initial branch again (‘paperclip’) and run rails server.
5) It works.

I have no idea what is causing this or what fixes it because seemingly i’m not doing anything for either case. Please help!

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1 Answer

Editorial Team · Answer 1 · 2026-05-26T10:19:30+00:00

Editorial Team

2026-05-26T10:19:30+00:00Added an answer on May 26, 2026 at 10:19 am

looks like ‘bcrypt_ext’ gem is not installed on your server!

Make sure to run bundle install after updating the source code, e.g. switching branches, or pulling new code revisions..

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