title: Error updating indexes using python in google appengine
body: <p>I'm trying to upload a python sample application onto my own appspot account. It works fine on localhost but whenever I uploads it via command line/gae launcher, I get this message:</p>
  
  <pre><code>Closing update: new version is ready to start serving.
  Uploading index definitions.
  Error 400: --- begin server output ---
  Building a composite index failed: ApplicationError: 1 
  --- end server output ---
  Your app was updated, but there was an error updating your indexes. Please retry later    with appcfg.py update_indexes.
  2011-05-16 02:45:15 (Process exited with code 0)
  </code></pre>
  
  <p>The result is that the deployed application cant be seen or has an error. When I run with appcfg.py update_indexes, they tell me index.yaml has errors. I tried to modify it but to no avail..</p>