rx.exceptions.MissingBackpressureException: This exception has no message.

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This exception has no message.
rx.exceptions.MissingBackpressureException:
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.onNext(OperatorObserveOn.java:160)
at rx.internal.operators.OperatorUnsubscribeOn$1.onNext(OperatorUnsubscribeOn.java:52)
at rx.internal.operators.OperatorSubscribeOn$1$1.onNext(OperatorSubscribeOn.java:53)
at rx.observers.Subscribers$5.onNext(Subscribers.java:235)
at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onNext(OnSubscribeDoOnEach.java:101)
at rx.internal.operators.OnSubscribeDoOnEach$DoOnEachSubscriber.onNext(OnSubscribeDoOnEach.java:101)
at rx.internal.operators.OperatorMerge$MergeSubscriber.emitScalar(OperatorMerge.java:395)
at rx.internal.operators.OperatorMerge$MergeSubscriber.tryEmit(OperatorMerge.java:355)
at rx.internal.operators.OperatorMerge$InnerSubscriber.onNext(OperatorMerge.java:846)
at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber$1$1.onNext(OperatorRetryWithPredicate.java:115)
at rx.internal.operators.OperatorOnBackpressureLatest$LatestEmitter.emit(OperatorOnBackpressureLatest.java:165)
at rx.internal.operators.OperatorOnBackpressureLatest$LatestEmitter.onNext(OperatorOnBackpressureLatest.java:131)
at rx.internal.operators.OperatorOnBackpressureLatest$LatestSubscriber.onNext(OperatorOnBackpressureLatest.java:211)
at rx.internal.operators.OperatorMerge$MergeSubscriber.emitScalar(OperatorMerge.java:395)
at rx.internal.operators.OperatorMerge$MergeSubscriber.tryEmit(OperatorMerge.java:355)
at zlc.season.rxdownload.function.FileHelper.saveFile(FileHelper.java:142)
at zlc.season.rxdownload.function.DownloadHelper.saveNormalFile(DownloadHelper.java:152)
at zlc.season.rxdownload.entity.DownloadType$NormalDownload$1.call(DownloadType.java:48)
at zlc.season.rxdownload.entity.DownloadType$NormalDownload$1.call(DownloadType.java:45)
at rx.Observable.unsafeSubscribe(Observable.java:10142)
at rx.internal.operators.OperatorMerge$MergeSubscriber.onNext(OperatorMerge.java:248)
at rx.internal.operators.OperatorMerge$MergeSubscriber.onNext(OperatorMerge.java:148)
at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:77)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$RequestArbiter.request(RxJavaCallAdapterFactory.java:173)
at rx.internal.operators.OperatorSubscribeOn$1$1$1.request(OperatorSubscribeOn.java:80)
at rx.Subscriber.setProducer(Subscriber.java:211)
at rx.internal.operators.OnSubscribeMap$MapSubscriber.setProducer(OnSubscribeMap.java:102)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:152)
at retrofit2.adapter.rxjava.RxJavaCallAdapterFactory$CallOnSubscribe.call(RxJavaCallAdapterFactory.java:138)
at rx.Observable.unsafeSubscribe(Observable.java:10142)
at rx.internal.operators.OperatorSubscribeOn$1.call(OperatorSubscribeOn.java:94)
at rx.internal.schedulers.CachedThreadScheduler$EventLoopWorker$1.call(CachedThreadScheduler.java:230)
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:423)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:269)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)

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