title: Why my rake db:migrate throws error message?
body: <p>I am developing Rails v2.3 application. </p>
  
  <p>When I run "rake db:migrate" I got the following error message:</p>
  
  <pre><code>rake/rdoctask is deprecated.  Use rdoc/task instead (in RDoc 2.4.2+)
  rake aborted!
  Access denied for user 'root'@'localhost' (using password: NO)
  
  Tasks: TOP =&gt; db:migrate
  (See full trace by running task with --trace)
  </code></pre>
  
  <p>What is the reason?</p>