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Home/ Questions/Q 8900657
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Editorial Team
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Editorial Team
Asked: June 15, 20262026-06-15T01:09:04+00:00 2026-06-15T01:09:04+00:00

I made a change to backends.py and I’m trying to upload the project and

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I made a change to backends.py and I’m trying to upload the project and am getting an error. I have used the rollback command as well but I keep getting the error.

 Error 409: --- begin server output ---
 Another transaction by user admin is already in progress for app: s~test-appx, 
 backend: urlstat. That user can undo the transaction with "appcfg backends rollback".
--- end server output ---

Does anyone have any idea about this?

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  1. Editorial Team
    Editorial Team
    2026-06-15T01:09:05+00:00Added an answer on June 15, 2026 at 1:09 am

    This happens on occasion when something terrible happens during a push. If you wait long enough, it will eventually time out and you will be able to update normally again.

    The lock is specific to a version of your application. So, if time is short, you can work around this error by pushing to a different version, and then making it the default from the appspot.com dashboard.

    The -V flag allows you to specify which version to target.

    appcfg.py -V 2 update ./myapp
    
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