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This exception has no message.
java.lang.NullPointerException: 	at com.googlecode.objectify.impl.Keys.getMetadataSafe(Keys.java:62)	at com.googlecode.objectify.impl.Keys.rawKeyOf(Keys.java:36)	at com.googlecode.objectify.impl.Keys.keyOf(Keys.java:29)	at com.googlecode.objectify.Key.create(Key.java:62)	at com.googlecode.objectify.Ref.create(Ref.java:31)