The mapper function returned a null value.

[developeromI89]

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.admin1.testnewstudio, PID: 5956 io.reactivex.exceptions.OnErrorNotImplementedException: The mapper function returned a null value. at io.reactivex.internal.functions.Functions$OnErrorMissingConsumer.accept(Functions.java:704) at io.reactivex.internal.functions.Functions$OnErrorMissingConsumer.accept(Functions.java:701) at io.reactivex.internal.observers.ConsumerSingleObserver.onError(ConsumerSingleObserver.java:47) at io.reactivex.internal.operators.single.SingleMap$MapSingleObserver.onError(SingleMap.java:69) at io.reactivex.internal.operators.single.SingleMap$MapSingleObserver.onSuccess(SingleMap.java:60) at io.reactivex.internal.operators.single.SingleObserveOn$ObserveOnSingleObserver.run(SingleObserveOn.java:81) at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(HandlerScheduler.java:109) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:135) at android.app.ActivityThread.main(ActivityThread.java:5268) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:902) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:697) Caused by: java.lang.NullPointerException: The mapper function returned a null value. at io.reactivex.internal.functions.ObjectHelper.requireNonNull(ObjectHelper.java:39) at io.reactivex.internal.operators.single.SingleMap$MapSingleObserver.onSuccess(SingleMap

[rickAllDev]

same issue here with the demo code. To correct, paste in url example and you get message indicating demo account has exceeded credits. I created new demo account, activated free web services, changed the value of username in RetrofitHelper class and everything works fine.

[BismeetSingh]

OnErrorNotImplementedException.