title: Android sdk main.out.xml parsing error
body: <p>I just started a new Android project, helloword" to continue learning Android development and I got stumped compiling the default 'helloword' compile / run. I think that I missed a step in configuration and setup, but I am at a loss to find out where. I have an AVD configured, set and launched.</p>
  
  <p>When I press 'run as', i can not find android2.1 simulator.and find these errors:</p>
  
  <pre><code>[2012-07-25 08:59:49 - helloword] res\layout\activity_main.xml:0: error: Resource entry activity_main is already defined.
  [2012-07-25 08:59:49 - helloword] res\layout\activity_main.out.xml:0: Originally defined here.
  [2012-07-25 08:59:49 - helloword] E:\android软件开发\新建文件夹\helloword\res\layout\activity_main.out.xml:1: error: Error parsing XML: no element found
  [2012-07-25 10:03:12 - helloword] /helloword/gen already exists but is not a source folder. Convert to a source folder or rename it.
  [2012-07-25 10:03:13 - helloword] /helloword/gen already exists but is not a source folder. Convert to a source folder or rename it.
  [2012-07-25 10:03:15 - helloword] File is Out of sync
  [2012-07-25 10:05:13 - helloword] /helloword/gen already exists but is not a source folder. Convert to a source folder or rename it.
  [2012-07-25 10:08:44 - helloword] activity_main.out.xml is out of sync. Please refresh.
  [2012-07-25 10:08:45 - helloword] activity_main.out.xml is out of sync. Please refresh.
  </code></pre>