title: GAE data download shows datastore_errors.BadRequestError
body: <p>I'm trying to download data from my Google App Engine app, using <a href="http://code.google.com/appengine/docs/python/tools/uploadingdata.html#Setting_Up_remote_api">the official instructions</a></p>
  
  <p>Remote API is set up &amp; I call:</p>
  
  <pre><code>appcfg.py download_data --application=appname --url=http://app.address.com/_ah/remote_api --filename=alldata.csv
  </code></pre>
  
  <p>The connection is established, I'm being asked for my e-mail &amp; password, and then a long trace appears ending up with this:</p>
  
  <blockquote>
    <p>google.appengine.api.datastore_errors.BadRequestError: app s~appname cannot access app appname's data</p>
  </blockquote>
  
  <p>Any ideas?</p>