环境相关： ruby 2.3.0 所有安装按照https://ruby-china.org/wiki/install_ruby_guide里的方式进行。
然后安装 passenger： gem install passenger
passenger -v Phusion Passenger 5.0.26
但 git clone 项目，bundle install 后，在项目的目录下 passenger 居然找不到：
alex@alex-VirtualBox:~/chen/work/ttt$ cd obms
alex@alex-VirtualBox:~/chen/work/ttt/obms$ passenger -v
/home/alex/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/specification.rb:2158:in `method_missing': undefined method `this' for #<Gem::Specification:0x48499e2 passenger-5.0.26> (NoMethodError)
from /home/alex/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/specification.rb:1057:in `find_active_stub_by_path'
from /home/alex/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:64:in `require'
from /home/alex/.rvm/gems/ruby-2.3.0/gems/passenger-5.0.26/bin/passenger:33:in `<top (required)>'
from /home/alex/.rvm/gems/ruby-2.3.0/bin/passenger:23:in `load'
from /home/alex/.rvm/gems/ruby-2.3.0/bin/passenger:23:in `<main>'
from /home/alex/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in `eval'
from /home/alex/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in `<main>'
但在上层路径居然可以：
alex@alex-VirtualBox:~/chen/work/ttt/obms$ cd ..
alex@alex-VirtualBox:~/chen/work/ttt$ passenger -v
Phusion Passenger 5.0.26
请问各位有遇到过类似问题吗？
直接在 Gemfile 加入 gem 'passenger' 就可以了。 但不明白为什么不通过 bundler 管理，单独安装就会找不到，而且我确定 ruby 版本都对。
#2 楼 @huacnlee 通过 which 查看是一样的：
alex@alex-VirtualBox:~/chen/work/ttt/obms$ passenger -v
/home/alex/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/specification.rb:2158:in `method_missing': undefined method `this' for #<Gem::Specification:0x4baa294 passenger-5.0.26> (NoMethodError)
from /home/alex/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/specification.rb:1057:in `find_active_stub_by_path'
from /home/alex/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:64:in `require'
from /home/alex/.rvm/gems/ruby-2.3.0/gems/passenger-5.0.26/bin/passenger:33:in `<top (required)>'
from /home/alex/.rvm/gems/ruby-2.3.0/bin/passenger:23:in `load'
from /home/alex/.rvm/gems/ruby-2.3.0/bin/passenger:23:in `<main>'
from /home/alex/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in `eval'
from /home/alex/.rvm/gems/ruby-2.3.0/bin/ruby_executable_hooks:15:in `<main>'
alex@alex-VirtualBox:~/chen/work/ttt/obms$ which passenger
/home/alex/.rvm/gems/ruby-2.3.0/bin/passenger
alex@alex-VirtualBox:~/chen/work/ttt/obms$ cd ..
alex@alex-VirtualBox:~/chen/work/ttt$ which passenger
/home/alex/.rvm/gems/ruby-2.3.0/bin/passenger
alex@alex-VirtualBox:~/chen/work/ttt$ passenger -v
Phusion Passenger 5.0.26
