Question: Unable to update app: Error posting to URL: <https://appengine.google.com/api/appversion/create?app_id=ethereal-zodiac-803&version=1&>
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".

See the deployment console for more details
Unable to update app: Error posting to URL: <https://appengine.google.com/api/appversion/create?app_id=ethereal-zodiac-803&version=1&>
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".

Answer: 
In MAC os `appcfg.py rollback` 

Example:

```
$ appcfg.py rollback workspace/api-asia01/
09:38 AM Application: api-asia01
09:38 AM Host: appengine.google.com
09:38 AM Rolling back the update.

```
If anyone who has this issue is using Android Studio or Intellij, you can go to your Gradle/Maven tasks, click backend. and click Tasks, click google app engine, and click Rollback. instead of messing with the terminal.