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我正在将我的应用程序部署到生产环境中（好吧，至少尝试这样做）。我一直遇到这个错误：

/opt/www/sunstar/shared/bundle/ruby/2.1.0/gems/wicked_pdf-0.11.0/lib/wicked_pdf/railtie.rb:6:in `<top (required)>': uninitialized constant Rails::VERSION (NameError)
    from /opt/www/sunstar/shared/bundle/ruby/2.1.0/gems/wicked_pdf-0.11.0/lib/wicked_pdf.rb:27:in `require'
    from /opt/www/sunstar/shared/bundle/ruby/2.1.0/gems/wicked_pdf-0.11.0/lib/wicked_pdf.rb:27:in `<top (required)>'
    from /opt/www/sunstar/releases/20150325005143/config/application.rb:2:in `require'
    from /opt/www/sunstar/releases/20150325005143/config/application.rb:2:in `<top (required)>'
    from /opt/www/sunstar/shared/bundle/ruby/2.1.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:141:in `require'
    from /opt/www/sunstar/shared/bundle/ruby/2.1.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:141:in `require_application_and_environment!'
    from /opt/www/sunstar/shared/bundle/ruby/2.1.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:67:in `console'
    from /opt/www/sunstar/shared/bundle/ruby/2.1.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /opt/www/sunstar/shared/bundle/ruby/2.1.0/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

有人有这个错误的经验吗？我正在使用 railties 4.2.0，我看到 4.2.1 已经发布，但不确定是否应该更新或回滚。

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