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java.lang.UnsupportedOperationException: No fallback available.	at com.netflix.hystrix.HystrixCommand.getFallback(HystrixCommand.java:284)	at feign.hystrix.HystrixInvocationHandler$1.getFallback(HystrixInvocationHandler.java:108)	at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:307)	at com.netflix.hystrix.HystrixCommand$2.call(HystrixCommand.java:303)	at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:46)	at rx.internal.operators.OnSubscribeDefer.call(OnSubscribeDefer.java:35)	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:50)	at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)