title: rvm -can't set the version to 1.9.3
body: <pre><code>$ ruby -v
  $ ruby 1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]
  </code></pre>
  
  <p>I have:</p>
  
  <pre><code>rvm list rubies
  
  rvm rubies
  
     ree-1.8.7-2011.03 [ x86_64 ]
   * ruby-1.9.3-p125 [ x86_64 ]
  
  # =&gt; - current
  # =* - current &amp;&amp; default
  #  * - default
  </code></pre>
  
  <p>but I get:</p>
  
  <pre><code>$ ruby soduko.rb 
  nil
  nil
  </code></pre>
  
  <p>I can't switch to 1.9.3:</p>
  
  <pre><code>rvm use 1.9.3
  Gemset '' does not exist, 'rvm gemset create ' first, or append '--create'.
  
  $ rvm gemset create
  # Noting(?)
  
  $ rvm gemset create md
  Gemset '' does not exist, 'rvm gemset create ' first, or append '--create'.
  
  $ ruby -v
  $ ruby 1.8.7 (2011-06-30 patchlevel 352) [x86_64-linux]
  </code></pre>