title: Why suddenly I got the error "Unable to resolve target 'android-9' "?
body: <p>I am developing android application (android-2.1-updated) under Ubuntu 10.04, with Eclipse IDE. I have successfully set up my working environment couple of weeks ago, and developing well (I can run my app on the connected device).</p>
  
  <p>But this morning, after I run ubuntu updates, then I restart my PC, then I start my eclipse, the eclipse console immediately throw an <strong>error message</strong> : </p>
  
  <p><code>AndroidAdaptiveUI Unable to resolve target 'android-9'</code>  . </p>
  
  <p>Very strange, everything is running fine before I restart my PC. But after the restart, I can not run my android app on my device.</p>
  
  <p>What does this error message means? What should I do to get rid from it? </p>
  
  <p>What I tried is to restart adb server by: </p>
  
  <pre><code>adb kill-server
  
  adb start-server
  
  adb devices
  </code></pre>
  
  <p>But, Then I got the following new error:</p>
  
  <pre><code>[2011-07-18 14:28:32 - DeviceMonitor]Adb connection Error:EOF
  [2011-07-18 14:28:32 - DeviceMonitor]Connection attempts: 1
  [2011-07-18 14:28:33 - DeviceMonitor]Connection attempts: 2
  [2011-07-18 14:28:34 - DeviceMonitor]Connection attempts: 3
  </code></pre>
  
  <p>Anybody can help me please?</p>