我在puppet master上的apache登录中遇到以下错误： 任何想法在这里可能是错的：
[ E 2018-03-11 07:50:58.9057 10913/T8 age/Cor/Con/CheckoutSession.cpp:285 ]: [Client 1-1] Cannot checkout session because a spawning error occurred. The identifier of the error is cd3585fe. Please see earlier logs for details about the error.
App 10950 stdout:
App 10950 stdout:
[ E 2018-03-11 07:51:03.0922 10913/Te age/Cor/App/Implementation.cpp:304 ]: Could not spawn process for application /usr/share/puppet/rack/puppetmasterd: An error occurred while starting up the preloader.
Error ID: 01cd04d1
Error details saved to: /tmp/passenger-error-sAcbhg.html
Message from application: cannot load such file -- puppet/util/command_line (LoadError)
/usr/local/rvm/rubies/ruby-2.4.1/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'
/usr/local/rvm/rubies/ruby-2.4.1/lib/ruby/site_ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'
config.ru:32:in `block in <main>'
/usr/local/rvm/gems/ruby-2.4.1/gems/rack-2.0.4/lib/rack/builder.rb:55:in `instance_eval'
/usr/local/rvm/gems/ruby-2.4.1/gems/rack-2.0.4/lib/rack/builder.rb:55:in `initialize'
config.ru:1:in `new'
config.ru:1:in `<main>'
/usr/local/rvm/gems/ruby-2.4.1/gems/passenger-5.2.1/src/helper-scripts/rack-preloader.rb:110:in `eval'
/usr/local/rvm/gems/ruby-2.4.1/gems/passenger-5.2.1/src/helper-scripts/rack-preloader.rb:110:in `preload_app'
/usr/local/rvm/gems/ruby-2.4.1/gems/passenger-5.2.1/src/helper-scripts/rack-preloader.rb:156:in `<module:App>'
/usr/local/rvm/gems/ruby-2.4.1/gems/passenger-5.2.1/src/helper-scripts/rack-preloader.rb:30:in `<module:PhusionPassenger>'
/usr/local/rvm/gems/ruby-2.4.1/gems/passenger-5.2.1/src/helper-scripts/rack-preloader.rb:29:in `<main>'
我的配置： Centos 6.5， Puppet 3.8.7， 阿帕奇/ 2.2.15， Phusion Passenger 5.2.1