title: rake aborted! ERROR: 'rake/rdoctask' is obsolete and no longer supported
body: <p>I installed rails 3.2.3 in my pc but for my new project i need to work in rails 3.0.5 so I installed 3.0.5 version of rails and now when i write any rake command i get the following error</p>
  
  <pre><code>rake aborted! ERROR: 'rake/rdoctask' is obsolete and no longer supported. Use 'rdoc/task' (available in RDoc 2.4.2+) instead.
  </code></pre>
  
  <p>currently this rake version is installed in my pc rake (10.1.0)</p>
  
  <p>I know the error says everything but im new in ruby and rails. So i don't understand what to do. I googled it but most of the solutions ask to update rails </p>