RxJava: Caused by: java.util.concurrent.RejectedExecutionException

java.lang.IllegalStateException: Fatal Exception thrown on Scheduler.Worker thread.
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:62)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:136)
    at android.app.ActivityThread.main(ActivityThread.java:5052)
    at java.lang.reflect.Method.invokeNative(Method.java)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
    at dalvik.system.NativeStart.main(NativeStart.java)
Caused by: java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@42e962a8 rejected from java.util.concurrent.ScheduledThreadPoolExecutor@43308cf8[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 1]
    at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2011)
    at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:793)
    at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:298)
    at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:503)
    at java.util.concurrent.ScheduledThreadPoolExecutor.submit(ScheduledThreadPoolExecutor.java:602)
    at rx.internal.schedulers.NewThreadWorker.scheduleActual(NewThreadWorker.java:239)
    at rx.internal.schedulers.NewThreadWorker.schedule(NewThreadWorker.java:224)
    at rx.internal.schedulers.NewThreadWorker.schedule(NewThreadWorker.java:216)
    at rx.internal.operators.OperatorSubscribeOn$1$1$1.request(OperatorSubscribeOn.java:82)
    at rx.Subscriber.request(Subscriber.java:157)
    at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:225)
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
    ... 9 more
java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@42e962a8 rejected from java.util.concurrent.ScheduledThreadPoolExecutor@43308cf8[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 1]
    at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2011)
    at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:793)
    at java.util.concurrent.ScheduledThreadPoolExecutor.delayedExecute(ScheduledThreadPoolExecutor.java:298)
    at java.util.concurrent.ScheduledThreadPoolExecutor.schedule(ScheduledThreadPoolExecutor.java:503)
    at java.util.concurrent.ScheduledThreadPoolExecutor.submit(ScheduledThreadPoolExecutor.java:602)
    at rx.internal.schedulers.NewThreadWorker.scheduleActual(NewThreadWorker.java:239)
    at rx.internal.schedulers.NewThreadWorker.schedule(NewThreadWorker.java:224)
    at rx.internal.schedulers.NewThreadWorker.schedule(NewThreadWorker.java:216)
    at rx.internal.operators.OperatorSubscribeOn$1$1$1.request(OperatorSubscribeOn.java:82)
    at rx.Subscriber.request(Subscriber.java:157)
    at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:225)
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
    at android.os.Handler.handleCallback(Handler.java:733)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:136)
    at android.app.ActivityThread.main(ActivityThread.java:5052)
    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:793)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
    at dalvik.system.NativeStart.main(NativeStart.java)`

hi ,Suddenly appeared this bug, now I have no idea, ask for help；

    compile 'com.squareup.retrofit2:retrofit:2.0.2'
    compile 'com.squareup.okhttp3:logging-interceptor:3.0.1'
    compile 'com.squareup.retrofit2:converter-gson:2.0.2'
    compile 'com.squareup.retrofit2:adapter-rxjava:2.0.2'
    compile 'io.reactivex:rxandroid:1.2.0'
    compile 'io.reactivex:rxjava:1.1.5'