NullPointerException: Attempt to invoke virtual method 'android.os.Handler android.app.FragmentHostCallback.getHandler()' on a null object reference

phone: OPPO R17 /OPPO R15 android os: 8.1.0 log:

io.reactivex.exceptions.OnErrorNotImplementedException: The exception was not handled due to missing onError handler in the subscribe() method call. Further reading: https://github.com/ReactiveX/RxJava/wiki/Error-Handling | java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Handler android.app.FragmentHostCallback.getHandler()' on a null object reference 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.LambdaObserver.onError(LambdaObserver.java:77) at io.reactivex.internal.observers.LambdaObserver.onNext(LambdaObserver.java:67) at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.drainNormal(ObservableObserveOn.java:201) at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.run(ObservableObserveOn.java:255) at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(HandlerScheduler.java:124) at android.os.Handler.handleCallback(Handler.java:790) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:198) at android.app.ActivityThread.main(ActivityThread.java:7015) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:523) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Handler android.app.FragmentHostCallback.getHandler()' on a null object reference at android.app.FragmentManagerImpl.ensureExecReady(FragmentManager.java:1992) at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2045) at android.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:799) at com.tbruyelle.rxpermissions2.RxPermissions.getRxPermissionsFragment(RxPermissions.java:57) at com.tbruyelle.rxpermissions2.RxPermissions.<init>(RxPermissions.java:44) at com.showfitness.commonlibrary.manager.MyManager.init(MyManager.java:143) at com.showfitness.commonlibrary.manager.MyManager.access$200(MyManager.java:59) at com.showfitness.commonlibrary.manager.MyManager$3.accept(MyManager.java:127) at com.showfitness.commonlibrary.manager.MyManager$3.accept(MyManager.java:124) at io.reactivex.internal.observers.LambdaObserver.onNext(LambdaObserver.java:63) ... 10 more java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Handler android.app.FragmentHostCallback.getHandler()' on a null object reference at android.app.FragmentManagerImpl.ensureExecReady(FragmentManager.java:1992) at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2045) at android.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:799) at com.tbruyelle.rxpermissions2.RxPermissions.getRxPermissionsFragment(RxPermissions.java:57) at com.tbruyelle.rxpermissions2.RxPermissions.<init>(RxPermissions.java:44) at com.showfitness.commonlibrary.manager.MyManager.init(MyManager.java:143) at com.showfitness.commonlibrary.manager.MyManager.access$200(MyManager.java:59) at com.showfitness.commonlibrary.manager.MyManager$3.accept(MyManager.java:127) at com.showfitness.commonlibrary.manager.MyManager$3.accept(MyManager.java:124) at io.reactivex.internal.observers.LambdaObserver.onNext(LambdaObserver.java:63) at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.drainNormal(ObservableObserveOn.java:201) at io.reactivex.internal.operators.observable.ObservableObserveOn$ObserveOnObserver.run(ObservableObserveOn.java:255) at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(HandlerScheduler.java:124) at android.os.Handler.handleCallback(Handler.java:790) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:198) at android.app.ActivityThread.main(ActivityThread.java:7015) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:523) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)