command line - Error when installing Ruby: 'requirements_osx_port_install_port' -

I am trying to load Ruby 2.0.0 rvm on my MacBook Pro but I'm getting this error

('requirements_osx_port_install_port') and

"Please read / user / Kelsey /.rvm/log/ruby-2.0.0-p195/1371938583_port_install.log ". .

Other people had apparently had the same problem which was decided by visiting them

XCode> Preferences & gt; Download & gt; Command Line Tools & gt; Install

But it was not good for me. After installing Xcode, xcode & gt; Preferences & gt; Download & gt; Visit;