java.lang.IllegalStateException:? ??at?rx.android.schedulers.LooperScheduler$ScheduledAction.run?(LooperScheduler.java:112) ??at?android.os.Handler.handleCallback?(Handler.java:883) ??at?android.os.Handler.dispatchMessage?(Handler.java:100) ??at?android.os.Looper.loop?(Looper.java:224) ??at?android.app.ActivityThread.main?(ActivityThread.java:7560) ??at?java.lang.reflect.Method.invoke?(Method.java) ??at?com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run?(RuntimeInit.java:539) ??at?com.android.internal.os.ZygoteInit.main?(ZygoteInit.java:950) Caused?by:?rx.exceptions.OnErrorNotImplementedException:? ??at?rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call?(InternalObservableUtils.java:386) ??at?rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call?(InternalObservableUtils.java:383) ??at?rx.internal.util.ActionSubscriber.onError?(ActionSubscriber.java:44) ??at?rx.observers.SafeSubscriber._onError?(SafeSubscriber.java:153) ??at?rx.observers.SafeSubscriber.onError?(SafeSubscriber.java:115) ??at?rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.checkTerminated?(OperatorObserveOn.java:273) ??at?rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call?(OperatorObserveOn.java:216) ??at?rx.android.schedulers.LooperScheduler$ScheduledAction.run?(LooperScheduler.java:107) ??at?android.os.Handler.handleCallback?(Handler.java:883) ??at?android.os.Handler.dispatchMessage?(Handler.java:100) ??at?android.os.Looper.loop?(Looper.java:224) ??at?android.app.ActivityThread.main?(ActivityThread.java:7560) ??at?java.lang.reflect.Method.invoke?(Method.java) ??at?com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run?(RuntimeInit.java:539) ??at?com.android.internal.os.ZygoteInit.main?(ZygoteInit.java:950) Caused?by:?rx.exceptions.MissingBackpressureException:? ??at?rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.onNext?(OperatorObserveOn.java:160) ??at?rx.internal.operators.OnSubscribeTimerPeriodically$1.call?(OnSubscribeTimerPeriodically.java:52) ??at?rx.internal.schedulers.SchedulePeriodicHelper$1.call?(SchedulePeriodicHelper.java:72) ??at?rx.internal.schedulers.EventLoopsScheduler$EventLoopWorker$2.call?(EventLoopsScheduler.java:189) ??at?rx.internal.schedulers.ScheduledAction.run?(ScheduledAction.java:55) ??at?java.util.concurrent.Executors$RunnableAdapter.call?(Executors.java:462) ??at?java.util.concurrent.FutureTask.run?(FutureTask.java:266) ??at?java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run?(ScheduledThreadPoolExecutor.java:301) ??at?java.util.concurrent.ThreadPoolExecutor.runWorker?(ThreadPoolExecutor.java:1167) ??at?java.util.concurrent.ThreadPoolExecutor$Worker.run?(ThreadPoolExecutor.java:641) ??at?java.lang.Thread.run?(Thread.java:919)