RxJava: Exception in RxJava and cannot debug the root cause

I am getting this exception in my app. There is just one timer in the whole app and I have applied BackPressureDrop just after interval() and am logging the error in my subscribers’ onError() but this crash keeps on repeating. Please help!!

Fatal Exception: java.lang.IllegalStateException: Exception thrown on Scheduler.Worker thread. Add `onError` handling.
       at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:60)
       at android.os.Handler.handleCallback(Handler.java:808)
       at android.os.Handler.dispatchMessage(Handler.java:103)
       at android.os.Looper.loop(Looper.java:193)
       at android.app.ActivityThread.main(ActivityThread.java:5300)
       at java.lang.reflect.Method.invokeNative(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:515)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:830)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:646)
       at dalvik.system.NativeStart.main(NativeStart.java)
Caused by rx.exceptions.OnErrorNotImplementedException
       at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:386)
       at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:383)
       at rx.internal.util.ActionSubscriber.onError(ActionSubscriber.java:44)
       at rx.observers.SafeSubscriber._onError(SafeSubscriber.java:157)
       at rx.observers.SafeSubscriber.onError(SafeSubscriber.java:120)
       at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.checkTerminated(OperatorObserveOn.java:276)
       at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:219)
       at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
       at android.os.Handler.handleCallback(Handler.java:808)
       at android.os.Handler.dispatchMessage(Handler.java:103)
       at android.os.Looper.loop(Looper.java:193)
       at android.app.ActivityThread.main(ActivityThread.java:5300)
       at java.lang.reflect.Method.invokeNative(Method.java)
       at java.lang.reflect.Method.invoke(Method.java:515)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:830)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:646)
       at dalvik.system.NativeStart.main(NativeStart.java)
Caused by rx.exceptions.MissingBackpressureException
       at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.onNext(OperatorObserveOn.java:162)
       at rx.internal.operators.OperatorSubscribeOn$1$1.onNext(OperatorSubscribeOn.java:53)
       at rx.internal.operators.OnSubscribeTimerPeriodically$1.call(OnSubscribeTimerPeriodically.java:52)
       at rx.Scheduler$Worker$1.call(Scheduler.java:134)
       at rx.internal.schedulers.EventLoopsScheduler$EventLoopWorker$2.call(EventLoopsScheduler.java:187)
       at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
       at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
       at java.util.concurrent.FutureTask.run(FutureTask.java:237)
       at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:152)
       at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:265)
       at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
       at java.lang.Thread.run(Thread.java:841)