This question is also trying to find out the answer for this question that I posted several days ago.
The weird thing about the AndroidChat app is when I changed the
It looks like you have only changed on chat message, not all of them. When the code attempts to deserialize a message that you haven't changed to author2, it cannot find the author field and throws an exception.
Try either changing all of the messages to author2, or clear out your data and start over with the new field names.