[~]# rvm list

rvm rubies

   ruby-1.9.2-p290 [ i386 ]
   ruby-1.8.7-p352 [ i386 ]

 [~]# rvm use 1.9.2
Using /usr/local/rvm/gems/ruby-1.9.2-p290
 [~]# rvm gemset create runtime
ERROR: Missing RVM environment file: '/usr/local/rvm/environments/ruby-1.9.2-head'
ERROR: Can not create gemset before using a ruby.  Try 'rvm use <some ruby>'.
 [~]# rvm use ruby-1.9.2-p290
Using /usr/local/rvm/gems/ruby-1.9.2-p290
 [~]# rvm gemset create runtime
ERROR: Missing RVM environment file: '/usr/local/rvm/environments/ruby-1.9.2-head'
ERROR: Can not create gemset before using a ruby.  Try 'rvm use <some ruby>'.