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rx.exceptions.OnErrorThrowable$OnNextValue: OnError while emitting onNext value: com.couchbase.client.core.message.kv.RemoveResponse.class	at rx.exceptions.OnErrorThrowable.addValueAsLastCause(OnErrorThrowable.java:109)	at rx.exceptions.Exceptions.throwOrReport(Exceptions.java:188)	at rx.internal.operators.OperatorMap$1.onNext(OperatorMap.java:56)	at rx.observers.Subscribers$5.onNext(Subscribers.java:234)	at rx.subjects.SubjectSubscriptionManager$SubjectObserver.onNext(SubjectSubscriptionManager.java:223)	at rx.subjects.AsyncSubject.onCompleted(AsyncSubject.java:101)	at com.couchbase.client.core.endpoint.AbstractGenericHandler.completeResponse(AbstractGenericHandler.java:354)	at com.couchbase.client.core.endpoint.AbstractGenericHandler.access$000(AbstractGenericHandler.java:72)	at com.couchbase.client.core.endpoint.AbstractGenericHandler$1.call(AbstractGenericHandler.java:372)	at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)