title: Updated Android ADT, now getting errors
body: <p>I've just updated my android adt to version 17 and now i cant start my android projects. When I try to update it gives me an error:</p>
  
  <blockquote>
    <p>This Android SDK requires Android Developer Toolkit version 17.0.0 or above.  Current version is 16.0.1.v201112150204-238534.  Please update ADT to the latest version.</p>
  </blockquote>
  
  <p>I've tried to update again but it shows me this</p>
  
  <pre><code>Cannot complete the request.  See the error log for details.  
  Android DDMS will be ignored because it is already installed, and updates are not permitted.  
  Android Development Tools will be ignored because it is already installed, and updates are not permitted.  
  Android Hierarchy Viewer will be ignored because it is already installed, and updates are not permitted.  
  Android Traceview will be ignored because it is already installed, and updates are not permitted.  
  </code></pre>
  
  <p>Is there a way to fix this or can i downgrade adt to fix this problem</p>