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retrofit.RetrofitError: 400 Bad Request	at retrofit.RetrofitError.httpError(	at retrofit.RestAdapter$RestHandler.invokeRequest(	at retrofit.RestAdapter$RestHandler.access$100(	at retrofit.RestAdapter$RestHandler$1.invoke(	at retrofit.RxSupport$	at java.util.concurrent.Executors$	at	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at retrofit.Platform$Base$2$	at