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我似乎无法让我的Ruby项目运行，每次我运行这个错误弹出红宝石错误'需要'：无法加载这样的文件 - bcrypt_ext（LoadError）
C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bcrypt-3.1.7-x86-mingw32/li
b/bcrypt.rb:16:in `require': cannot load such file -- bcrypt_ext (LoadError)
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bcrypt-3.1.7-x
86-mingw32/lib/bcrypt.rb:16:in `rescue in <top (required)>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bcrypt-3.1.7-x
86-mingw32/lib/bcrypt.rb:12:in `<top (required)>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler/runtime.rb:76:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler/runtime.rb:76:in `block (2 levels) in require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler/runtime.rb:72:in `each'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler/runtime.rb:72:in `block in require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler/runtime.rb:61:in `each'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler/runtime.rb:61:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/bundler-1.7.7/
lib/bundler.rb:133:in `require'
from C:/Projects/Mailbox/mailboxer-app/config/application.rb:14:in `<top
(required)>'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.4
/lib/rails/commands/commands_tasks.rb:79:in `require'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.4
/lib/rails/commands/commands_tasks.rb:79:in `block in server'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.4
/lib/rails/commands/commands_tasks.rb:76:in `tap'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.4
/lib/rails/commands/commands_tasks.rb:76:in `server'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.4
/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.1.4
/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
请帮助。