Cannot deploy app, cannot modify any settings

[Pambo Paschalides]

Today, whenever I try to deploy my app, I get the following:

...

Closing update: new version is ready to start serving.

Rolling back the update.

Error 503: --- begin server output ---

Application Busy (503)

Multiple clients are trying to modify the same application.

--- end server output ---

Moreover, I cannot modify any settings in my app. For example disabling the app, or modifying in anything, results in message "Application busy. Multiple clients are trying to modify the same application.". 

What is going on here? :S

[Johan Euphrosine]

This issue is tracked there:
http://code.google.com/p/googleappengine/issues/detail?id=5474

If it is still not working for you can you add a comment with your appid ?

Thanks in advance.

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Johan Euphrosine (proppy)
Developer Programs Engineer
Google Developer Relations