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Disposable already set!
java.lang.IllegalStateException: Disposable already set!	at io.reactivex.internal.disposables.DisposableHelper.reportDisposableSet(DisposableHelper.java:121)	at io.reactivex.internal.disposables.DisposableHelper.setOnce(DisposableHelper.java:61)	at io.reactivex.internal.operators.single.SingleSubscribeOn$SubscribeOnObserver.onSubscribe(SingleSubscribeOn.java:63)	at io.reactivex.internal.operators.single.SingleCreate.subscribeActual(SingleCreate.java:36)	at io.reactivex.Single.subscribe(Single.java:2143)	at io.reactivex.internal.operators.single.SingleSubscribeOn$1.run(SingleSubscribeOn.java:41)	at io.reactivex.Scheduler$1.run(Scheduler.java:120)	at io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:58)	at io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:51)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at java.util.concurrent.ScheduledThreadPoolExecutor$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)