我一直在我的 Rails 应用程序上使用 rmagick 做一些很酷的事情。我尝试使用“rails server”启动我的项目，但出现此错误。我相信我已经安装了 imagemagick 和 rmagick，所以我不知道为什么会看到这个错误。
/Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require': no such file to load -- RMagick (LoadError)
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:225:in `load_dependency'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:591:in `new_constants_in'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:225:in `load_dependency'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require'
from /Users/devinross14/Documents/Philo/philo/lib/paperclip_processors/cropper.rb:1
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:225:in `load_dependency'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:591:in `new_constants_in'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:225:in `load_dependency'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require'
from /Users/devinross14/Documents/Philo/philo/vendor/plugins/paperclip/lib/paperclip.rb:46
from /Users/devinross14/Documents/Philo/philo/vendor/plugins/paperclip/lib/paperclip.rb:45:in `each'
from /Users/devinross14/Documents/Philo/philo/vendor/plugins/paperclip/lib/paperclip.rb:45
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:225:in `load_dependency'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:591:in `new_constants_in'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:225:in `load_dependency'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require'
from /Users/devinross14/Documents/Philo/philo/vendor/plugins/paperclip/lib/paperclip/railtie.rb:1
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:225:in `load_dependency'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:591:in `new_constants_in'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:225:in `load_dependency'
from /Users/devinross14/.gem/ruby/1.8/gems/activesupport-3.0.0/lib/active_support/dependencies.rb:239:in `require'
from /Users/devinross14/Documents/Philo/philo/vendor/plugins/paperclip/rails/init.rb:1
from /Library/Ruby/Gems/1.8/gems/railties-3.0.0/lib/rails/plugin.rb:81
from /Library/Ruby/Gems/1.8/gems/railties-3.0.0/lib/rails/initializable.rb:25:in `instance_exec'
from /Library/Ruby/Gems/1.8/gems/railties-3.0.0/lib/rails/initializable.rb:25:in `run'
from /Library/Ruby/Gems/1.8/gems/railties-3.0.0/lib/rails/initializable.rb:50:in `run_initializers'
from /Library/Ruby/Gems/1.8/gems/railties-3.0.0/lib/rails/initializable.rb:49:in `each'
from /Library/Ruby/Gems/1.8/gems/railties-3.0.0/lib/rails/initializable.rb:49:in `run_initializers'
from /Library/Ruby/Gems/1.8/gems/railties-3.0.0/lib/rails/application.rb:134:in `initialize!'
from /Library/Ruby/Gems/1.8/gems/railties-3.0.0/lib/rails/application.rb:77:in `send'
from /Library/Ruby/Gems/1.8/gems/railties-3.0.0/lib/rails/application.rb:77:in `method_missing'
from /Users/devinross14/Documents/Philo/philo/config/environment.rb:5
from /Users/devinross14/Documents/Philo/philo/config.ru:3:in `require'
from /Users/devinross14/Documents/Philo/philo/config.ru:3
from /Library/Ruby/Gems/1.8/gems/rack-1.2.1/lib/rack/builder.rb:46:in `instance_eval'
from /Library/Ruby/Gems/1.8/gems/rack-1.2.1/lib/rack/builder.rb:46:in `initialize'
from /Users/devinross14/Documents/Philo/philo/config.ru:1:in `new'
from /Users/devinross14/Documents/Philo/philo/config.ru:1