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这是说 bcrypt 未加载的错误。rails 应用程序没有使用 Devise 进行身份验证，并且 gem bcrypt 不在 Gemfile 中。有时，网络服务器会抛出错误，说生成服务器无法启动。gem list 显示 bcrypt-ruby 3.0.1 和 3.0.0 都已安装。

Ruby (Rack) application could not be started
A source file that the application requires, is missing.

    *
      It is possible that you didn't upload your application files correctly. Please check whether all your application files are uploaded.
    *
      A required library may not installed. Please install all libraries that this application requires.

Further information about the error may have been written to the application's log file. Please check it in order to analyse the problem.

Error message:
    no such file to load -- bcrypt
Exception class:
    LoadError
Application root:
    /vol/www/emclab/current 
Backtrace:
    #   File    Line    Location
    0   /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/dependencies.rb    240     in `require'
    1   /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/dependencies.rb    240     in `block in require'
    2   /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/dependencies.rb    225     in `load_dependency'
    3   /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activesupport-3.1.0/lib/active_support/dependencies.rb    240     in `require'
    4   /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activemodel-3.1.0/lib/active_model/secure_password.rb     1   in `'
    5   /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/base.rb  2160    in `block in '
    6   /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/base.rb  2140    in `class_eval'
    7   /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/base.rb  2140    in `'
    8   /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/base.rb  31  in `'
    9   /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/session_store.rb     77  in `'
    10  /vol/www/emclab/shared/bundle/ruby/1.9.1/gems/activerecord-3.1.0/lib/active_record/session_store.rb     51  in `'

上限部署：检查返回：

You appear to have all necessary dependencies installed

对这个问题有什么想法吗？谢谢！

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