The specified child already has a parent. You must call removeView() on the child's parent first.

[596861134]

Thread Name: 'main'
Back traces starts.
java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
at android.view.ViewGroup.addViewInner(ViewGroup.java:5264)
at android.view.ViewGroup.addView(ViewGroup.java:5093)
at androidx.viewpager.widget.ViewPager.addView(ViewPager.java:1485)
at android.view.ViewGroup.addView(ViewGroup.java:5030)
at androidx.fragment.app.FragmentStateManager.addViewToContainer(FragmentStateManager.java:833)
at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:523)
at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:282)
at androidx.fragment.app.FragmentStore.moveToExpectedState(FragmentStore.java:112)
at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1647)
at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:3128)
at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:3072)
at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:251)
at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:502)
at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:246)
at com.trello.rxlifecycle4.components.support.RxAppCompatActivity.onStart(RxAppCompatActivity.java:80)
at cn.droidlover.xdroidmvp.mvp.XActivity.onStart(XActivity.java:89)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1468)
at android.app.Activity.performStart(Activity.java:8224)
at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3799)
at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:221)
at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:201)
at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:173)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:97)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2291)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loopOnce(Looper.java:211)
at android.os.Looper.loop(Looper.java:300)
at android.app.ActivityThread.main(ActivityThread.java:8322)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:556)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1038)
Back traces ends.