Google App Engine: appcfg.py rollback - Stack Overflow

Try this: appcfg.py rollback <directory>

If your application myapp resides in C:\Users\Nilesh\Documents\ then directory path should be C:\Users\Nilesh\Documents\myapp

If you installed Google App Engine Launcher in your system, then installation path should be something like this C:\Program Files\Google\google_appengine

Now open the command prompt and type the following:

C:\Program Files\Google\google_appengine>appcfg.py rollback C:\Users\Nilesh\Documents\myapp  

This will solve your issue. :)

Read full article from Google App Engine: appcfg.py rollback - Stack Overflow