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Disposable already set!
java.lang.IllegalStateException: Disposable already set!	at io.reactivex.internal.disposables.DisposableHelper.reportDisposableSet(	at io.reactivex.internal.disposables.DisposableHelper.setOnce(	at io.reactivex.internal.operators.single.SingleSubscribeOn$SubscribeOnObserver.onSubscribe(	at io.reactivex.internal.operators.single.SingleCreate.subscribeActual(	at io.reactivex.Single.subscribe(	at io.reactivex.internal.operators.single.SingleSubscribeOn$	at io.reactivex.Scheduler$	at	at	at	at java.util.concurrent.ScheduledThreadPoolExecutor$	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at