From this stack trace, it looks like you’re re-using a client/node name that already exists on the server. Some recent changes to the API have made this raise a different error than it used to, but it wouldn’t have worked before. The best way to deal with this is to delete the "client-machine” client and node on the server before you bootstrap a new one.
We will look at making a change to have this produce a clearer error (I think the error message was much better in the past).
[2015-08-10T13:51:53-04:00] DEBUG: ---- HTTP Response Body ----
[2015-08-10T13:51:53-04:00] DEBUG: {"error":["Client already exists"]}
[2015-08-10T13:51:53-04:00] DEBUG: ---- End HTTP Response Body -----
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