Unable to update app: Error posting to URL: https://appengine.google.com/api/appversion/create?app_id=metacdn&version=1&
409 Conflict
Another transaction by user featheast.lee is already in progress for this app and major version. That user can undo the transaction with appcfg.py's "rollback" command.
See the deployment console for more details
I haven't seen error before, and have no clue how it comes out. After several google page, I found a way to solve this problem.
1. Open your terminal and get into the directory of your project. ( For windows users, please do it in CMD accordingly).
2. Execute the sh script of appcfg.sh under with the parameter of rollback and war. You should prefix the path of your appcfg.sh, which is usually under the directory of eclipse plugin. ( Windows guys, continue to use cmd to replace the sh script)
3. Now after successfully rollback the deployment, you are free to do anything you want to now.
I guess the same story should be applied to Python as well, just simply use the appcfg.py instead of the script and things should work out.
PS: I got a ZipExeption during the rollback process with a warning that Could not find API version from .svn. Though it still solves my deploy issue.
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