title: How to rollback the appcfg in Google App Engine?
body: <p>Unable to update app: Error posting to URL: <a href="https://appengine.google.com/api/appversion/create?app_id=ethereal-zodiac-803&amp;version=1&amp;">https://appengine.google.com/api/appversion/create?app_id=ethereal-zodiac-803&amp;version=1&amp;</a>
  409 Conflict
  Another transaction by user suganya.karthik is already in progress for app: s~ethereal-zodiac-803, version: 1. That user can undo the transaction with "appcfg rollback".</p>
  
  <p>See the deployment console for more details
  Unable to update app: Error posting to URL: <a href="https://appengine.google.com/api/appversion/create?app_id=ethereal-zodiac-803&amp;version=1&amp;">https://appengine.google.com/api/appversion/create?app_id=ethereal-zodiac-803&amp;version=1&amp;</a>
  409 Conflict
  Another transaction by user suganya.karthik is already in progress for app: s~ethereal-zodiac-803, version: 1. That user can undo the transaction with "appcfg rollback".</p>