rx.exceptions.CompositeException: 4 exceptions occurred.

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rx.exceptions.CompositeException: 4 exceptions occurred.
at rx.internal.operators.OperatorMerge$MergeSubscriber.reportError(OperatorMerge.java:255)
at rx.internal.operators.OperatorMerge$MergeSubscriber.checkTerminate(OperatorMerge.java:797)
at rx.internal.operators.OperatorMerge$MergeSubscriber.emitLoop(OperatorMerge.java:690)
at rx.internal.operators.OperatorMerge$MergeSubscriber.emitScalar(OperatorMerge.java:416)
at rx.internal.operators.OperatorMerge$MergeSubscriber.tryEmit(OperatorMerge.java:340)
at rx.internal.operators.OperatorMerge$InnerSubscriber.onNext(OperatorMerge.java:825)
at rx.subjects.SubjectSubscriptionManager$SubjectObserver.onNext(SubjectSubscriptionManager.java:223)
at rx.subjects.PublishSubject.onNext(PublishSubject.java:114)
at com.polidea.rxandroidble.internal.connection.RxBleGattCallback$1$$Lambda$7.call(Unknown Source)
at rx.Observable$27.onNext(Observable.java:8571)
at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:139)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:215)
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:269)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)

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