There is also a similar thread on GAE java group:
http://groups.google.com/group/google-appengine-java/browse_thread/thread/2e95788ff97472de#.
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If you need the data, if you downgrade the SDK, you should be able to access
the data so you can export it to reimport. We've seen this before with
version switches. More likely than not, it's related to the fact that the
datastore stub (local_db.bin) is just a serialized Java object. When we try
